Prospectus

Growth Equity

Delaware Select Growth Fund
(Class A, Class B, Class C, Class R)

August 28, 2008

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus, and any representation to the contrary is a criminal offense.

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Visit www.delawareinvestments.com/edelivery.

Temporary defensive positions

For temporary defensive purposes, we may hold a substantial part of the Fund’s assets in high-quality, fixed income securities, cash or cash equivalents, or other high-quality, short-term instruments. To the extent that the Fund holds these investments, the Fund may be unable to achieve its investment objective.

Portfolio turnover

It is possible that the Fund’s annual portfolio turnover may be greater than 100%. A turnover rate of 100% would occur if, for example, the Fund bought and sold all of the securities in its portfolio once in the course of a year or frequently traded a single security. A high rate of portfolio turnover in any year may increase brokerage commissions paid and could generate taxes for shareholders on realized investment gains.

The risks of investing in the Fund

Investing in any mutual fund involves risk, including the risk that you may receive little or no return on your investment, and the risk that you may lose part or all of the money you invest. Before you invest in the Fund, you should carefully evaluate the risks. Because of the nature of the Fund, you should consider your investment to be a long-term investment that typically provides the best results when held for a number of years. The table below describes the principal risks you assume when investing in the Fund. Please see the SAI for a further discussion of these risks and other risks not discussed here.

Market risk   

Market risk is the risk that all or a majority of the securities in a certain market — like the stock or bond market — will decline in value because of economic conditions, future expectations, or investor confidence.

How the Fund strives to manage it: We maintain a long-term investment approach

and focus on securities that we believe can appreciate over an extended period of time regardless of interim market fluctuations. We do not try to predict overall stock market movements and though we may hold securities for any amount of time, we generally do not trade for short-term purposes.

Industry and security risks  

Industry risk is the risk that the value of securities in a particular industry will decline because of changing expectations for the performance of that industry.

Security risk is the risk that the value of an individual stock or bond will decline because of changing expectations for the performance of the individual company issuing the stock or bond.

How the Fund strives to manage them: We maintain a diversified portfolio representing a number of different industries. We limit the amount of the Fund’s assets invested in any one industry and in any individual security. We also follow a rigorous selection process when choosing securities and continually monitor them while they remain in the portfolio.

Issuer concentration risk  

The portfolio generally holds 25 to 30 securities, although from time to time, the portfolio may hold fewer or more securities depending on our assessment of the investment opportunities available. This allows us to focus on the potential of those particular issuers, but it also means that the

Fund may be more volatile than those funds that hold a greater number of securities.

How the Fund strives to manage it: We follow a rigorous selection process when choosing securities and continually monitor them while they remain in the portfolio.

Company size risk  

Company size risk is the risk that prices of small- and medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.

How the Fund strives to manage it: We seek opportunities among companies of all sizes. Because the Fund’s portfolio does not concentrate specifically on small- or medium-sized companies, this risk may be balanced by our holdings of large companies.

Interest rate risk  

Interest rate risk is the risk that securities will decrease in value if interest rates rise. The risk is generally associated with bonds; however, because small- and medium-sized companies often borrow money to finance their operations, they may be adversely affected by rising interest rates.

How the Fund strives to manage it: We analyze each company’s financial situation and its cash flow to determine the company’s ability to finance future expansion and operations. The potential effect that rising interest rates might have on a stock is taken into consideration before the stock is purchased.

Liquidity risk  

Liquidity risk is the possibility that securities cannot be readily sold within seven days at approximately the price at which a fund has valued them.

How the Fund strives to manage it: We limit exposure to illiquid securities to 15% of the Fund’s net assets.

Disclosure of portfolio holdings information

A description of the Fund’s policies and procedures with respect to the disclosure of the Fund’s portfolio securities is available in the Fund’s SAI.

Investment manager

The Fund is managed by Delaware Management Company (Manager), a series of Delaware Management Business Trust, which is a subsidiary of Delaware Management Holdings, Inc. The Manager makes investment decisions for the Fund, manages the Fund’s business affairs, and provides daily administrative services. For its services to the

Fund, the Manager was paid an aggregate fee, net of fee waivers, of 0.62% of average daily net assets during the last fiscal year.

A discussion of the basis for the Board’s approval of the Fund’s investment advisory contract is available in the Fund’s semiannual report to shareholders for the period ended October 31, 2007.

Portfolio managers

Jeffrey S. Van Harte, Christopher J. Bonavico, Kenneth F. Broad, Patrick G. Fortier, Gregory M. Heywood, Daniel J. Prislin, and Christopher M. Ericksen comprise the portfolio management team that makes day-to-day investment decisions for Delaware Select Growth Fund. Each member of the portfolio management team serves as a generalist and has a significant role in making investment recommendations. The Fund is divided into segments with each portfolio manager having investment discretion with respect to his assigned segment. No individual member of the portfolio management team has primary responsibility for managing the Fund. Messrs. Van Harte, Bonavico, Broad, Fortier, Heywood, and Prislin assumed responsibility for the Fund in May 2005. Mr. Ericksen assumed responsibility for the Fund in July 2007.

Jeffrey S. Van Harte, CFA, Senior Vice President, Chief Investment Officer – Focus Growth Equity
Jeffrey S. Van Harte is the chief investment officer for the Focus Growth Equity team, responsible for large-cap growth, all-cap growth, and one smid-cap growth portfolio.
 

Prior to joining Delaware Investments in April 2005, he was a principal and executive vice president at Transamerica Investment Management. Van Harte has been managing portfolios and separate accounts for more than 20 years. Before becoming a portfolio manager, Van Harte was a securities analyst and trader for Transamerica Investment Services, which he joined in 1980. Van Harte received his bachelor’s degree in finance from California State University at Fullerton.

Christopher J. Bonavico, CFA, Vice President, Senior Portfolio Manager, Equity Analyst
Christopher J. Bonavico, who joined Delaware Investments in April 2005, is a senior portfolio manager on the firm’s Focus Growth Equity team. This team is responsible for large-cap growth, all-cap growth, and one smid-cap growth portfolio. He was most recently a principal and portfolio manager at Transamerica Investment Management, where he managed sub-advised funds and institutional separate accounts. Before joining Transamerica in 1993, he was a research analyst for Salomon Brothers. Bonavico received his bachelor’s degree in economics from the University of Delaware.

Kenneth F. Broad, CFA, Vice President, Senior Portfolio Manager, Equity Analyst
Kenneth F. Broad, who joined Delaware Investments in April 2005, is a senior portfolio manager on the firm’s Focus Growth Equity team. This team is responsible for large-cap growth, all-cap growth, and one smid-cap growth portfolio. Most recently, he was a principal and portfolio manager at Transamerica Investment Management, where he also managed sub-advised funds and institutional separate accounts. Before joining Transamerica in 2000, he was a portfolio manager with The Franklin Templeton Group and was a consultant in the business valuation and merger and acquisition group at KPMG Peat Marwick. He received an MBA from the University of California at Los Angeles and his bachelor’s degree in economics from Colgate University.

Patrick G. Fortier, CFA, Vice President, Portfolio Manager, Equity Analyst
Patrick G. Fortier, who joined Delaware Investments in April 2005, is a portfolio manager on the Focus Growth Equity team. This team is responsible for large-cap growth, all-cap growth, and one smid-cap growth portfolio. He was most recently a portfolio manager at Transamerica Investment Management. Before joining Transamerica in 2000, he worked for OLDE Equity Research as an equity analyst. Fortier received his bachelor’s degree in finance from the University of Kentucky.

Gregory M. Heywood, CFA, Vice President, Portfolio Manager, Equity Analyst
Gregory M. Heywood, who joined Delaware Investments in April 2005, is a portfolio manager and analyst on the firm’s Focus Growth Equity team. This team is responsible for large-cap growth, all-cap growth, and one smid-cap growth portfolio. He was most recently a research analyst at Transamerica Investment Management. Before joining Transamerica in 2004, he worked as a senior analyst for Wells Capital Management from 2003 to 2004 and Montgomery Asset Management from 1996 to 2003. Heywood received a bachelor’s degree and an MBA from the University of California at Berkeley.

Daniel J. Prislin, CFA, Vice President, Senior Portfolio Manager, Equity Analyst
Daniel J. Prislin joined Delaware Investments in April 2005 as a senior portfolio manager on the firm’s Focus Growth Equity team, which is responsible for large-cap growth, all-cap growth, and one smid-cap growth portfolio. He was most recently a principal and portfolio manager at Transamerica Investment Management, where he also managed sub-advised funds and institutional separate accounts. Prior to joining Transamerica in 1998, he was a portfolio manager with The Franklin Templeton Group. Prislin received an MBA and bachelor’s degree in business administration from the University of California at Berkeley.
 

Christopher M. Ericksen, CFA, Vice President, Portfolio Manager, Equity Analyst
Christopher M. Ericksen joined Delaware Investments in April 2005 as a portfolio manager on the firm’s Focus Growth Equity team, which is responsible for large-cap growth, all-cap growth, and one smid-cap growth portfolio. He was most recently a portfolio manager at Transamerica Investment Management, where he also managed institutional separate accounts. Before joining Transamerica in 2004, he was a vice president

at Goldman Sachs. During his 10 years there, he worked in investment banking as well as investment management. Ericksen received his bachelor’s degree from Carnegie Mellon University, with majors in industrial management, economics, and political science.

The Fund’s SAI provides additional information about the portfolio managers’ compensation, other accounts managed by the portfolio managers, and the portfolio managers’ ownership of Fund shares.

Manager of managers structure

The Fund and the Manager have received an exemptive order from the U.S. Securities and Exchange Commission (SEC) to operate under a manager of managers structure that permits the Manager, with the approval of the Board, to appoint and replace sub-advisors, enter into sub-advisory agreements, and materially amend and terminate sub-advisory agreements on behalf of the Fund without shareholder approval (Manager of Managers Structure). Under the Manager of Managers Structure, the Manager has ultimate responsibility, subject to oversight by the Fund’s Board, for overseeing the Fund’s sub-advisors and recommending to the Board their hiring, termination, or replacement. The SEC order does not apply to any sub-advisor that is affiliated with the Fund or the Manager. While the Manager does not currently expect to use the Manager of

Managers Structure with respect to the Fund, the Manager may, in the future, recommend to the Fund’s Board the establishment of the Manager of Managers Structure by recommending the hiring of one or more sub-advisors to manage all or a portion of the Fund’s portfolio.

The Manager of Managers Structure enables the Fund to operate with greater efficiency and without incurring the expense and delays associated with obtaining shareholder approvals for matters relating to sub-advisors or sub-advisory agreements. The Manager of Managers Structure does not permit an increase in the overall management and advisory fees payable by the Fund without shareholder approval. Shareholders will be notified of any changes made to sub-advisors or sub-advisory agreements within 90 days of the change.

Who’s who?

Board of trustees: A mutual fund is governed by a board of trustees, which has oversight responsibility for the management of the fund’s business affairs. Trustees establish procedures and oversee and review the performance of the investment manager, the distributor, and others that perform services for the fund. Generally, at least 40% of the board of trustees must be independent of a fund’s investment manager and distributor. However, the Fund relies on certain exemptive rules adopted by the SEC that require its Board to be comprised of a majority of such independent Trustees. These independent Trustees, in particular, are advocates for shareholder interests.

Investment manager: An investment manager is a company responsible for selecting portfolio investments consistent with the

objective and policies stated in the mutual fund’s prospectus. The investment manager places portfolio orders with broker/dealers and is responsible for obtaining the best overall execution of those orders. A written contract between a mutual fund and its investment manager specifies the services the investment manager performs. Most management contracts provide for the investment manager to receive an annual fee based on a percentage of the fund’s average daily net assets. The investment manager is subject to numerous legal restrictions, especially regarding transactions between itself and the funds it advises.

Portfolio managers: Portfolio managers are employed by the investment manager to make investment decisions for individual portfolios on a day-to-day basis.

Custodian: Mutual funds are legally required to protect their portfolio securities and most funds place them with a qualified bank custodian that segregates fund securities from other bank assets.

Distributor: Most mutual funds continuously offer new shares to the public through distributors that are regulated as broker/dealers and are subject to the Financial Industry Regulatory Authority (FINRA) rules governing mutual fund sales practices.

Financial intermediary wholesaler: Pursuant to a contractual arrangement with a fund’s distributor, a financial intermediary wholesaler is primarily responsible for promoting the sale of fund shares through broker/dealers, financial advisors, and other financial intermediaries.

Service agent: Mutual fund companies employ service agents (sometimes called “transfer agents”) to maintain records of shareholder accounts, calculate and disburse dividends and capital gains, and prepare and mail shareholder

statements and tax information, among other functions. Many service agents also provide customer service to shareholders.

Financial advisors: Financial advisors provide advice to their clients, analyzing their financial objectives and recommending appropriate funds or other investments. Financial advisors are associated with securities broker/dealers who have entered into selling and/or service arrangements with the distributor. Selling broker/dealers and financial advisors are compensated for their services, generally through sales commissions, and through 12b-1 fees and/or service fees deducted from a fund’s assets.

Shareholders: Like shareholders of other companies, mutual fund shareholders have specific voting rights. Material changes in the terms of a fund’s management contract must be approved by a shareholder vote, and funds seeking to change fundamental investment policies must also seek shareholder approval.

• Class A shares have an up-front sales charge of up to 5.75% that you pay when you buy the shares.
   
• If you invest $50,000 or more, your front-end sales charge will be reduced.
   
• You may qualify for other reduced sales charges, and, under certain circumstances, the sales charge may be waived, as described in “How to reduce your sales charge,” below.
   
• Class A shares are also subject to an annual 12b-1 fee no greater than 0.25% of average daily net assets, which is lower than the

• Class A shares generally are not subject to a CDSC, except in the limited circumstances described in the table below.
   
• Class A shares generally are not available for purchase by anyone qualified to purchase Class R shares, except as described below.

Class A sales charges
The table below details your sales charges on purchases of Class A shares. The offering price for Class A shares includes the front-end sales charge. The sales charge as a percentage of the net amount invested is the maximum percentage of the amount invested rounded to the nearest hundredth. The actual sales charge that you pay as a percentage of the offering price and as a percentage of the net amount invested will vary depending on the then-current NAV, the percentage rate of sales charge, and rounding.

Class B  

As of May 31, 2007, no new or subsequent investments, including investments through automatic investment plans and by qualified retirement plans (such as 401(k) plans, 403(b) plans, or 457 plans), are allowed in the Fund’s Class B shares, except through a reinvestment of dividends or capital gains or permitted exchanges. Existing shareholders of Class B shares may continue to hold their Class B shares, reinvest dividends into Class B shares, and exchange their Class B shares of one Delaware Investments^® Fund for Class B shares of another Fund, as permitted by existing exchange privileges. Existing Class B shareholders wishing to make subsequent purchases in the Fund’s shares will be permitted to invest in other classes of the Fund, subject to that class’ pricing structure and eligibility requirements, if any.

For Class B shares outstanding as of May 31, 2007 and Class B shares acquired upon reinvestment of dividends or capital gains, all Class B share attributes, including the CDSC schedules, conversion to Class A schedule, and distribution and service (12b-1) fees, will continue in their current form. In addition, because the Fund’s or its Distributor’s ability to assess certain sales charges and fees is dependent on the sale of new shares, the termination of new purchases of Class B shares could ultimately lead to the elimination and/or reduction of such sales charges and fees. The Fund may not be able to provide shareholders with advance notice of the reduction in these sales charges and fees. You will be notified via a Prospectus supplement if there are any changes to any attributes, sales charges, or fees.

• Class B shares have no up-front sales charge, so the full amount of your purchase is invested in the Fund. However, you will pay a CDSC if you redeem your shares within six years after you buy them.
   
• If you redeem Class B shares during the first year after you buy them, the shares will be subject to a CDSC of 4.00%. The CDSC is 3.25% during the second year, 2.75% during the third year, 2.25% during the fourth and fifth years, 1.50% during the sixth year, and 0% thereafter.
   
• In determining whether the CDSC applies to a redemption of Class B shares, it will be assumed that shares held for more than six years are redeemed first, followed by shares acquired through the reinvestment of dividends or distributions, and finally by shares held longest during the six-year period. For further information on how the CDSC is determined, please see “Calculation of contingent deferred sales charges — Class B and Class C” below.

• Under certain circumstances, the CDSC may be waived; please see “Waivers of contingent deferred sales charges” below for further information.
   
• For approximately eight years after you buy your Class B shares, they are subject to an annual 12b-1 fee no greater than 1.00% of average daily net assets (of which 0.25% is a service fee) paid to the Distributor, dealers, or others for providing services and maintaining shareholder accounts.
   
• Because of the higher 12b-1 fee, Class B shares have higher expenses and any dividends paid on these shares are generally lower than dividends on Class A and Class R shares.
   
• Approximately eight years after you buy them, Class B shares automatically convert to Class A shares with a 12b-1 fee of no more than 0.25%. Conversion may occur as late as three months after the eighth anniversary of purchase, during which time Class B’s higher 12b-1 fee applies.
   

Class C

• Class C shares have no up-front sales charge, so the full amount of your purchase is invested in the Fund. However, you will pay a CDSC of 1.00% if you redeem your shares within 12 months after you buy them.
   
• In determining whether the CDSC applies to a redemption of Class C shares, it will be assumed that shares held for more than 12 months are redeemed first, followed by shares acquired through the reinvestment of dividends or distributions, and finally by shares held for 12 months or less. For further information on how the CDSC

• Under certain circumstances, the CDSC may be waived; please see “Waivers of contingent deferred sales charges” below for further information.
   
• Class C shares are subject to an annual 12b-1 fee no greater than 1.00% of average daily net assets (of which 0.25% is a service fee) paid to the Distributor, dealers, or others for providing services and maintaining shareholder accounts.

Certain sales charges may be based on historical cost. Therefore, you should maintain any records that substantiate these costs because the Fund, its transfer agent, and financial intermediaries may not maintain this information. Information about existing sales charges and sales charge reductions and waivers is available free of charge on the Delaware Investments^® Funds’ Web site at www.delawareinvestments.com. Additional information on sales charges can be found in the Fund’s SAI, which is available upon request.

By exchange

You may exchange all or part of your investment in one or more Delaware Investments^® Funds for shares of other Delaware Investments^® Funds. Please keep in mind, however, that under most circumstances you are allowed to exchange only between like classes of shares. To open an account by exchange, call the Shareholder Service Center at 800 523-1918.

Through automated shareholder services

You may purchase or exchange shares through Delaphone, our automated telephone service, or through our Web site, www.delawareinvestments.com. For more information about how to sign up for these services, call our Shareholder Service Center at 800 523-1918.

Once you have completed an application, you can open an account with an initial investment

of $1,000 and make additional investments at any time for as little as $100. The minimum initial purchase is $250, and you can make additional investments of $25 or more, if you are buying shares in an IRA or Roth IRA, under the Uniform Gifts to Minors Act or the Uniform Transfers to Minors Act, or through an Automatic Investing Plan. The minimum initial purchase for a Coverdell Education Savings Account (formerly, an “Education IRA”) is $500. The minimums vary for retirement plans other than IRAs, Roth IRAs, or Coverdell Education Savings Accounts.

The price you pay for shares will depend on when we receive your purchase order. If an authorized agent or we receive your order before the close of regular trading on the New York Stock Exchange (NYSE), which is normally 4:00 p.m. Eastern time, you will pay that day’s closing share price, which is based on a fund’s NAV. If your order is received after the close of regular trading on the NYSE, you will pay the next business day’s price. A business

day is any day that the NYSE is open for business (Business Day). We reserve the right to reject any purchase order.

We determine the NAV per share for each class of the Fund at the close of regular trading on the NYSE on each Business Day. The NAV per share for each class of the Fund is calculated by subtracting the liabilities of each class from its total assets and dividing the resulting number by the number of shares outstanding for that class. We generally price securities and other assets for which market quotations are readily available at their market

value. For a fund that invests primarily in foreign securities, the NAV may change on days when the shareholder will not be able to purchase or redeem fund shares. We price fixed income securities on the basis of valuations provided to us by an independent pricing service that uses methods approved by the Board. We price fixed income securities that have a maturity of less than 60 days at amortized cost, which approximates market value. For all other securities, we use methods approved by the Board that are designed to price securities at their fair market value.

Fair valuation

When the Fund uses fair value pricing, it may take into account any factors it deems appropriate. The Fund may determine fair value based upon developments related to a specific security, current valuations of foreign stock indices (as reflected in U.S. futures markets), and/or U.S. sector or broader stock market indices. The price of securities used by the Fund to calculate its NAV may differ from quoted or published prices for the same securities. Fair value pricing may involve subjective judgments and it is possible that the fair value determined for a security is materially different than the value that could be realized upon the sale of that security.

The Fund anticipates using fair value pricing for securities primarily traded on U.S. exchanges only under very limited circumstances, such as the early closing of the exchange on which a security is traded or suspension of trading in the security. The Fund may use fair value pricing more frequently for securities traded primarily in non-U.S. markets because, among other things, most foreign markets close well before the Fund values its securities at 4:00 p.m. Eastern time. The earlier

close of these foreign markets gives rise to the possibility that significant events, including broad market moves, may have occurred in the interim. To account for this, the Fund may frequently value many foreign equity securities using fair value prices based on third-party vendor modeling tools to the extent available.

Subject to the Board’s oversight, the Fund’s Board has delegated responsibility for valuing the Fund’s assets to a Pricing Committee of the Manager, which operates under the policies and procedures approved by the Board, as described above.

Retirement plans

In addition to being an appropriate investment for your IRA, Roth IRA, and Coverdell Education Savings Account, shares in the Fund may be suitable for group retirement plans. You may establish your IRA account even if you are already a participant in an employer-sponsored retirement plan. For more information on how shares in the Fund can play an important role in your retirement planning or for details about group plans, please consult your financial advisor, or call our Shareholder Service Center at 800 523-1918.

Document delivery

If you have an account in the same Delaware Investments^® Fund as another member of your household, we send your household one copy of the Fund’s prospectus and annual and semiannual reports unless you opt otherwise. This will help us reduce the printing and mailing expenses associated with the Fund.

We will continue to send one copy of each of these documents to your household until you notify us that you wish to receive individual materials. If you wish to receive individual materials, please call our Shareholder Service Center at 800 523-1918 or your financial advisor. We will begin sending you individual copies of these documents 30 days after receiving your request.

How to redeem shares

Through your financial advisor

Your financial advisor can handle all the details of redeeming your shares (selling them back to the Fund). Your financial advisor may charge a separate fee for this service.

By mail

You may redeem your shares by mail by writing to: Delaware Investments, P.O. Box 219656, Kansas City, MO 64121-9656 or 430 W. 7th Street, Kansas City, MO 64105 for redemptions by overnight courier service. All owners of the account must sign the request. For redemptions of more than $100,000, you must include a signature guarantee for each owner. Signature guarantees are also required when redemption proceeds are going to an address other than the address of record on the account.

Please note that no redemption order submitted by mail will be accepted until such redemption order is received by Delaware Investments at P.O. Box 219656, Kansas City, MO 64121-9656 for redemptions by regular mail or 430 W. 7th Street, Kansas City, MO 64105 for redemptions by overnight courier service. Please do not send redemption requests to 2005 Market Street, Philadelphia, PA 19103-7094.

By telephone

You may redeem up to $100,000 of your shares by telephone. You may have the proceeds sent to you by check, or, if you redeem at least $1,000 of shares, you may have the proceeds sent directly to your bank by wire. If you request a wire deposit, a bank wire fee may be deducted from your proceeds. Bank information must be on file before you request a wire redemption.

By wire

You may redeem $1,000 or more of your shares and have the proceeds deposited directly to your bank account, normally the next Business Day after we receive your request. If you request a wire deposit, a bank wire fee may be deducted from your proceeds. Bank information must be on file before you request a wire redemption.

Through automated shareholder services

You may redeem shares through Delaphone, our automated telephone service, or through our Web site, www.delawareinvestments.com. For more information about how to sign up for these services, call our Shareholder Service Center at 800 523-1918.

If you hold your shares in certificates, you must submit the certificates with your request to sell the shares. We recommend that you send your certificates by certified mail.

When you send us a properly completed request to redeem or exchange shares and an authorized agent or we receive the request before the close of regular trading on the NYSE (normally 4:00 p.m. Eastern time), you will receive the NAV next determined after we receive your request. If we receive your request after the close of regular trading on the NYSE, you will receive the NAV next determined on the next Business Day. We will deduct any applicable CDSCs. You may also have to pay taxes on the proceeds from your sale of shares. We will send you a check, normally the next Business Day, but no later than seven days after we receive your request to sell your shares. If you purchased your shares by check, we will wait until your check has cleared, which can take up to 15 days, before we send your redemption proceeds.

If you are required to pay a CDSC when you redeem your shares, the amount subject to the fee will be based on the shares’ NAV when you purchased them or their NAV when you redeem them, whichever is less. This arrangement assures that you will not pay a CDSC on any increase in the value of your shares. You also will not pay the charge on any shares acquired by reinvesting dividends or capital gains. If you exchange shares of one fund for shares of another, you do not pay a CDSC at the time of the exchange. If you later redeem those shares, the purchase price for purposes of the CDSC formula will be the price you paid for the original shares, not the exchange price. The redemption price for purposes of this formula will be the NAV of the shares you are actually redeeming.

Account minimums

If you redeem shares and your account balance falls below the required account minimum of $1,000 ($250 for IRAs, Roth IRAs, Uniform Gifts to Minors Act and Uniform Transfers to Minors Act accounts, or accounts with automatic investing plans, and $500 for Coverdell Education Savings Accounts) for three or more consecutive months, you will

have until the end of the current calendar quarter to raise the balance to the minimum. If your account is not at the minimum by the required time, you may be charged a $9 fee for that quarter and each quarter after that until your account reaches the minimum balance. If your account does not reach the minimum balance, the Fund may redeem your account after 60 days’ written notice to you.

Automatic investing plan

The automatic investing plan allows you to make regular monthly or quarterly investments directly from your checking account.

Direct deposit

With direct deposit, you can make additional investments through payroll deductions, recurring government or private payments such as Social Security, or direct transfers from your bank account.

Electronic delivery

With Delaware eDelivery, you can receive your fund documents electronically instead of via U.S. mail. When you sign up for eDelivery, you can access your account statements, shareholder reports, and other fund materials online, in a secure internet environment at any time, from anywhere.

Online account access

Online account access is a password-protected area of the Delaware Investments^® Funds’ Web site that gives you access to your account information and allows you to perform transactions in a secure internet environment.

Systematic exchange option

With the systematic exchange option, you can arrange automatic monthly exchanges between your shares in one or more Delaware Investments^® Funds. These exchanges are subject to the same rules as regular exchanges (see below) and require a minimum monthly exchange of $100 per fund.

Dividend reinvestment plan

Through our dividend reinvestment plan, you can have your distributions reinvested in your account or the same share class in another Delaware Investments^® Fund. The shares that you purchase through the dividend reinvestment plan are not subject to a front-end sales charge or to a CDSC. Under most circumstances, you may reinvest dividends only into like classes of shares.

Exchanges

You may generally exchange all or part of your shares for shares of the same class of another Delaware Investments^® Fund without paying a front-end sales charge or a CDSC at the time of the exchange. However, if you exchange shares from a money market fund that does not have a sales charge or from Class R shares of any fund, you will pay any applicable sales charge on your new shares. When exchanging Class B and Class C shares of one fund for the same class of shares in other funds, your new shares will be subject to the same CDSC as the shares you originally purchased. The holding period for the CDSC will also remain the same, with the amount of time you held your original shares being credited toward the holding period of your new shares. You do not pay sales charges on shares that you acquired through the reinvestment of dividends. You may have to pay taxes on your exchange. When you exchange shares, you are purchasing shares in another fund so you should be sure to get a copy of the fund’s prospectus and read it carefully before buying shares through an exchange. We may refuse the purchase side

of any exchange request if, in the Manager’s judgment, the Fund would be unable to invest effectively in accordance with its investment objective and policies or would otherwise potentially be adversely affected.

On demand service

Through the on demand service, you or your financial advisor may transfer money between your Fund account and your predesignated bank account by telephone request. This service is not available for retirement plans. There is a minimum transfer of $25 and a maximum transfer of $100,000, except for purchases into IRAs. Delaware Investments does not charge a fee for this service; however, your bank may assess one.

Direct deposit service

Through the direct deposit service, you can have $25 or more in dividends and distributions deposited directly to your bank account. Delaware Investments does not charge a fee for this service; however, your bank may assess one. This service is not available for retirement plans.

Systematic withdrawal plan

Through the systematic withdrawal plan, you can arrange a regular monthly or quarterly payment from your account made to you or someone you designate. If the value of your account is $5,000 or more, you can make withdrawals of at least $25 monthly, or $75 quarterly. You may also have your withdrawals deposited directly to your bank account through the direct deposit service.

The applicable Limited CDSC for Class A shares and the CDSC for Class B and C shares redeemed via a systematic withdrawal plan will be waived if the annual amount withdrawn in each year is less than 12% of the account balance on the date that the plan is established. If the annual amount withdrawn in any year exceeds 12% of the account balance on the date that the systematic withdrawal plan is established, all redemptions under the plan will be subject to the applicable CDSC, including an assessment for previously redeemed amounts under the plan.

Frequent trading of Fund shares

The Fund discourages purchases by market timers and purchase orders (including the purchase side of exchange orders) by shareholders identified as market timers may be rejected. The Fund’s Board has adopted policies and procedures designed to detect, deter, and prevent trading activity detrimental to the Fund and its shareholders, such as market timing. The Fund will consider anyone who follows a pattern of market timing in any Delaware Investments^® Fund or the Optimum Fund Trust to be a market timer and may consider anyone who has followed a similar pattern of market timing at an unaffiliated fund family to be a market timer.

Market timing of a fund occurs when investors make consecutive, rapid, short-term “roundtrips” — that is, purchases into a fund followed quickly by redemptions out of that fund. A short-term roundtrip is any redemption of fund shares within 20 Business Days of a purchase of that fund’s shares. If you make a second such short-term roundtrip in a fund within the same calendar quarter as a previous short-term roundtrip in that fund, you may be considered a market timer. In determining whether market timing has occurred, the Fund will consider short-term roundtrips to include rapid purchases and sales of Fund shares through the exchange privilege. The Fund reserves the right to consider other trading patterns to be market timing.

Your ability to use the Fund’s exchange privilege may be limited if you are identified as a market timer. If you are identified as a market timer, we will execute the redemption side of your exchange order but may refuse the purchase side of your exchange order. The Fund reserves the right to restrict or reject, without prior notice, any purchase order or

exchange order for any reason, including any purchase order or exchange order accepted by any shareholder’s financial intermediary or in any omnibus-type account. Transactions placed in violation of the Fund’s market timing policy are not necessarily deemed accepted by the Fund and may be rejected by the Fund on the next Business Day following receipt by the Fund.

Redemptions will continue to be permitted in accordance with the Fund’s current Prospectus. A redemption of shares under these circumstances could be costly to a shareholder if, for example, the shares have declined in value, the shareholder recently paid a front-end sales charge, the shares are subject to a CDSC, or the sale results in adverse tax consequences. To avoid this risk, a shareholder should carefully monitor the purchases, sales, and exchanges of Fund shares and avoid frequent trading in Fund shares.

The Fund reserves the right to modify this policy at any time without notice, including modifications to the Fund’s monitoring procedures and the procedures to close accounts to new purchases. Although the implementation of this policy involves judgments that are inherently subjective and may be selectively applied, we seek to make judgments and applications that are consistent with the interests of the Fund’s shareholders. While we will take actions designed to detect and prevent market timing, there can be no assurance that such trading activity will be completely eliminated. Moreover, the Fund’s market timing policy does not require the Fund to take action in response to frequent trading activity. If the Fund elects not to take any action in response to frequent trading, such frequent trading activity could continue.

Risks of market timing
By realizing profits through short-term trading, shareholders that engage in rapid purchases and sales or exchanges of the Fund’s shares dilute the value of shares held by long-term shareholders. Volatility resulting from excessive purchases and sales or exchanges of Fund shares, especially involving large dollar amounts, may disrupt efficient portfolio management. In particular, the Fund may have difficulty implementing its long-term investment strategies if it is forced to maintain a higher level of its assets in cash to accommodate significant short-term trading activity. Excessive purchases and sales or exchanges of the Fund’s shares may also force the Fund to sell portfolio securities at inopportune times to raise cash to accommodate short-term trading activity. This could adversely affect the Fund’s performance, if, for example, the Fund incurs increased brokerage costs and realization of taxable capital gains without attaining any investment advantage.

A fund that invests significantly in foreign securities may be particularly susceptible to short-term trading strategies. This is because foreign securities are typically traded on markets that close well before the time a fund calculates its NAV (normally 4:00 p.m. Eastern time). Developments that occur between the closing of the foreign market and a fund’s NAV calculation may affect the value of these foreign securities. The time zone differences among international stock markets can allow a shareholder engaging in a short-term trading strategy to exploit differences in fund share prices that are based on closing prices of foreign securities established some time before a fund calculates its own share price.

Any fund that invests in securities that are thinly traded, traded infrequently, or relatively illiquid has the risk that the securities prices used to calculate the fund’s NAV may not accurately reflect current market values. A shareholder may seek to engage in short-term trading to take advantage of these pricing differences. Funds that may be adversely affected by such arbitrage include, in particular, funds that significantly invest in small-cap securities, technology, and other specific industry sector securities, and in certain fixed income securities, such as high yield bonds, asset-backed securities, or municipal bonds.

Transaction monitoring procedures
The Fund, through its transfer agent, maintains surveillance procedures designed to detect excessive or short-term trading in Fund shares. This monitoring process involves several factors, which include scrutinizing transactions in Fund shares for violations of the Fund’s market timing policy or other patterns of short-term or excessive trading. For purposes of these transaction monitoring procedures, the Fund may consider trading activity by multiple accounts under common ownership, control, or influence to be trading by a single entity. Trading activity identified by these factors, or as a result of any other available information, will be evaluated to determine whether such activity might constitute market timing. These procedures may be modified from time to time to improve the detection of excessive or short-term trading or to address other concerns. Such changes may be necessary or appropriate, for example, to deal with issues specific to certain retirement plans; plan exchange limits; U.S. Department of Labor regulations; certain automated or pre-established exchange, asset-allocation, or

dollar cost averaging programs; or omnibus account arrangements.

Omnibus account arrangements are common forms of holding shares of the Fund, particularly among certain broker/dealers and other financial intermediaries, including sponsors of retirement plans and variable insurance products. The Fund will attempt to have financial intermediaries apply the Fund’s monitoring procedures to these omnibus accounts and to the individual participants in such accounts. However, to the extent that a financial intermediary is not able or willing to monitor or enforce the Fund’s frequent trading policy with respect to an omnibus account, the Fund or its agents may require the financial intermediary to impose its frequent trading policy, rather than the Fund’s policy, to shareholders investing in the Fund through the financial intermediary.

A financial intermediary may impose different requirements or have additional restrictions on the frequency of trading than the Fund. Such restrictions may include, without limitation, requiring the trades to be placed by U.S. mail, prohibiting purchases for a designated period of time (typically 30 to 90 days) by investors who have recently purchased or redeemed Fund shares, and similar restrictions. The Fund’s ability to impose such restrictions with respect to accounts traded through particular financial intermediaries may vary depending on systems capabilities, applicable contractual and legal restrictions, and cooperation of those financial intermediaries.

You should consult your financial intermediary regarding the application of such restrictions and to determine whether your financial intermediary imposes any additional or different limitations. In an effort to discourage

market timers in such accounts, the Fund may consider enforcement against market timers at the participant level and at the omnibus level, up to and including termination of the omnibus account’s authorization to purchase Fund shares.

Limitations on ability to detect and curtail market timing
Shareholders seeking to engage in market timing may employ a variety of strategies to avoid detection and, despite the efforts of the Fund and its agents to detect market timing in Fund shares, there is no guarantee that the Fund will be able to identify these shareholders or curtail their trading practices. In particular, the Fund may not be able to detect market timing attributable to a particular investor who effects purchase, redemption, and/or exchange activity in Fund shares through omnibus accounts. The difficulty of detecting market timing may be further compounded if these entities utilize multiple tiers or omnibus accounts.

Dividends, distributions, and taxes

Dividends and distributions
The Fund intends to qualify each year as a regulated investment company under the Code. As a regulated investment company, the Fund generally pays no federal income tax on the income and gains it distributes to you. The Fund expects to declare and distribute all of its net investment income, if any, to shareholders as dividends annually. The Fund will distribute net realized capital gains, if any, at least annually, usually in December. The Fund may distribute such income dividends and capital gains more frequently, if necessary, in order to reduce or eliminate federal excise or income taxes on the Fund. The amount of any

distribution will vary, and there is no guarantee the Fund will pay either an income dividend or a capital gains distribution. We automatically reinvest all dividends and any capital gains, unless you direct us to do otherwise.

Annual statements
Every January, you will receive a statement that shows the tax status of distributions you received the previous calendar year. Distributions declared in December to shareholders of record in such month, but paid in January, are taxable as if they were paid in December. The Fund may reclassify income after your tax reporting statement is mailed to you. Prior to issuing your statement, the Fund makes every effort to search for reclassified income to reduce the number of corrected forms mailed to shareholders. However, when necessary, the Fund will send you a corrected Form 1099-DIV to reflect reclassified information.

Avoid “buying a dividend”
If you are a taxable investor and invest in the Fund shortly before the record date of a taxable distribution, the distribution will lower the value of the Fund’s shares by the amount of the distribution and, in effect, you will receive some of your investment back in the form of a taxable distribution.

Tax considerations
In general, if you are a taxable investor, Fund distributions are taxable to you at either ordinary income or capital gains tax rates. This is true whether you reinvest your distributions in additional Fund shares or receive them in cash.

For federal income tax purposes, Fund distributions of short-term capital gains are taxable to you as ordinary income. Fund distributions of long-term capital gains are taxable to you as long-term capital gains no matter how long you have owned your shares. A portion of income dividends designated by the Fund may be qualified dividend income eligible for taxation by individual shareholders at long-term capital gain rates provided certain holding period requirements are met.

Sale or Redemption of Fund Shares
A sale or redemption of Fund shares is a taxable event and, accordingly, a capital gain or loss may be recognized. For tax purposes, an exchange of your Fund shares for shares of a different Delaware Investments^® Fund is the same as a sale.

Backup withholding
By law, if you do not provide the Fund with your proper taxpayer identification number and certain required certifications, you may be subject to backup withholding on any distributions of income, capital gains, or proceeds from the sale of your shares. The Fund also must withhold if the IRS instructs it to do so. When withholding is required, the amount will be 28% of any distributions or proceeds paid.

Other
Fund distributions and gains from the sale or exchange of your Fund shares generally are subject to state and local taxes. Non-U.S. investors may be subject to U.S. withholding at a 30% or lower treaty tax rate and U.S. estate tax and are subject to special U.S. tax

certification requirements to avoid backup withholding and claim any treaty benefits. The exemptions from U.S. withholding for short-term capital gain and interest-related dividends paid by the Fund to non-U.S. investors terminated and are no longer available for dividends paid by the Fund with respect to its taxable years beginning after April 30, 2008, unless such exemptions are reinstated.

This discussion of “Dividends, distributions, and taxes” is not intended or written to be used as tax advice. Because everyone’s tax situation is unique, you should consult your tax professional about federal, state, local, or foreign tax consequences before making an investment in the Fund.

Certain management considerations

Investments by fund of funds and similar investment vehicles
The Fund may accept investments from funds of funds, including those offered by the Delaware Investments^® Funds, as well as from similar investment vehicles, such as 529 Plans. A “529 Plan” is a college savings program that operates under Section 529 of the Code. From time to time, the Fund may experience large investments or redemptions due to allocations

or rebalancings by these funds of funds and/ or similar investment vehicles. While it is impossible to predict the overall impact of these transactions over time, there could be adverse effects on portfolio management. For example, the Fund may be required to sell securities or invest cash at times when it would not otherwise do so. These transactions could also have tax consequences if sales of securities result in gains, and could also increase transaction costs or portfolio turnover.

Prospectus

Growth equity

Delaware Select Growth Fund
(Institutional Class)

August 28, 2008

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus, and any representation to the contrary is a criminal offense.

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