The product, traditionally used to treat scald in stored Bramleys, has been removed from the market by the EU over health concerns.
Growers have been allowed to use up stocks for a year, but from June it will not be possible for them to use it.
English Apples & Pears chief executive Adrian Barlow said: "We had anticipated the potential loss of this product so there's been a lot of investigation into orchard management to minimise the affect of its withdrawal.
"There's been a massive investment in low-oxygen stores. We are also using Smartfresh so that we can store Bramleys for an entire year without using DPA.
"If there were good grounds for the registration to be withdrawn then we do not oppose that, bearing in mind the threat for consumers who want residues to be minimised. In fact, far from wanting to oppose the withdrawal we would support it."