Codling moth, lead, and DDT

Apples and pears can both be victims of the codling moth. This moth lays eggs which hatch into worms which eat their way into either apples or pears as well as some other fruits. This, of course, ruins the fruit and makes it unsellable. My father fought this problem in his orchards for as long as I can remember. Some early sprays for this bug included lead arsenic, sulphur, and horticulture...
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