The second day after the first frost is the best prevention and treatment time. Specific control methods: 2.5% lambda-cyhalothrin 2000 times or 24% methomyl soluble liquid agent 800 times or 10% imidacloprid wettable powder 1500 times spray. It is best to control twice, with an interval of 3 to 5 days, and it can also be combined with the measures of freezing prevention and trunk damage prevention to achieve the effect of killing two birds with one stone.
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