苹果棉蚜主要危害苹果、梨、山楂、李、榆等植物,为果树检疫性害虫。苹果棉蚜繁殖速度快,虫口数量大,1年繁殖数代,共体外有一层棉絮状物保护,药剂不易触杀,防治难度较大。一、发生规律苹果棉蚜每年繁殖8代以上,以1~2龄若虫在伤口处、粗皮裂缝、根颈部与根蘖及不定芽中越冬,少数以其他龄若虫和成蚜越冬。第2年气温回升到8℃时,越冬若虫开始活动,爬到嫩枝附近吸取汁液危害,并分泌棉絮状蜡质物。苹果棉蚜主要以孤雌胎 Apple aphid major harm to apples, pears, hawthorn, plum, elm and other plants, quarantine pests for fruit trees. Apple cotton aphid breeding speed, number of insect population, a few years of breeding a few generations, a total of a layer of cotton-like material outside the protection of drugs is not easy to touch, prevention and treatment more difficult. First, the occurrence of regular Apple aphid 8 years of breeding more than a year to 1 to 2 instar nymphs at the wounds, bark cracks, root and neck and root tillers and adventitious buds in the winter, a few other nymphs and winter aphids. The second year when the temperature rose to 8 ℃, the overwintering nymph began to move, climbed near the shoots absorb juice hazards, and secretion of cotton-like waxy material. Apple aphid mainly parthenogenesis