In the early stage of the disease, 25% metalaxyl, or 58% metalaxyl manganese zinc, or 40% ethylphosphine aluminum, or 64% antivirus (fosfosin + mancozeb), or 77% can be killed (hydrogenated Copper), or full-complexed mancozeb and other spray control, generally spray every 7 to 10 days, continuous spraying 2 to 3 times.
Biological pesticides http://
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