5.栗大蚜 该虫以卵在树干裂缝处或枝上越冬,次年4月孵化。5月下旬飞往枝条上危害,聚集新梢、果苞处吸食汁液,使枝梢枯萎,以致果实成熟不好。防治方法:冬季在蚜卵聚集处用火烧杀。在若蚜孵化时期或发生危害时期喷施40％乐果2000倍液。 5. Aphids chestnut insect to eggs in the trunk crack or branch overwintering, the following year in April hatch. May fly to the branches in late May endangered, gather new shoots, fruit buds at the juice, the shoots withered, resulting in poor fruit ripening. Prevention and treatment methods: Aphid eggs gathered in winter with fire to kill. Spray 40% dimethoate 2000 times in the event of aphids hatching or damage.