Pear trees need to prevent rot, dry rot, ring rot disease, black spot disease, powdery mildew, leaf spot, pear borer, and pear hibiscus. Control measures and effective medicines: Do a good job of formula fertilization, strengthen cultivation and management; do a good job of scraping, cutting, painting, burning, spraying, etc., and thoroughly clean up the orchard. Use 9281 series of drugs 5 to 6 times the drug solution brush sickle; before germination with 5 degrees of lime sulfur or 25% Sewter EC 1500 to 2000 times or 25% of the cyclopentane suspension 600 times the whole park.
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