How can I prevent sun scald or winter damage? Don’t spray peach trees at least 20 days before harvest to prevent residue problems in the fruit. Permethrin can also be used to treat the peach tree borer by spraying the lower trunk every two weeks starting about July 1. Permethrin insecticide applied mid-June will prevent the peach twig borer. Peaches are bothered by two insect pests the peach twig borer, which damages twigs and fruit, and the peach tree borer, which burrows into the lower trunk of the tree.
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