How to Prevent and Treat Apple Alternaria L

Apple leaf spot defoliation can be controlled by the following methods:

1. Cut diseased branches, remove fallen leaves, and burn them in the late fall and winter to reduce the initial source of infestation; strengthen cultivation and management: cut off long branches in summer, reduce late infestation sources, improve the permeability of orchards, orchards with low-lying land and high water levels. Pay attention to drainage. Rationally fertilize, increase tree vigor and increase disease resistance; blockade of epidemic areas, prohibit collection of diseased scions and purchase of diseased seedlings;

2. Chemical control: Before the onset of illness (after flowering in mid-May), spray 1:2:200 times Bordeaux fluid, 10% Shihai water dispersible granules 2000-2500 times, 70% mancozeb. Wet powder 400-600 times liquid, 50% acetaminophen wettable powder 1000 times, 50% fast-inking wettable powder 1000 times, 36% thiophanate-methyl suspension 500-600 times liquid, 5% bacteria Poison 600 times, 75% Dakkonin (chlorothalonil) WP 800x, 10% POM WP 1000x, 3% POX (new polyoxin) 800 times liquid and other agents for prevention and treatment.

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