Answer: Early spring is a critical period for the prevention and control of apple pests and diseases. First, it is necessary to clean the orchard, scrape bark lesions, reduce the density of the larvae, and then apply a wound protection agent. Spray 3 to 5 Baumide Lithosulfide mixture before and after pruning; in the orchard with serious rot, spray 40% methine WP 100 to 200 times; apple orchard serious orchard, Pentachlorophenol sodium spray 50 ~ 100 times; in the lobular disease orchard, spray 5% zinc sulfate solution.
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