苹果绵蚜是为害苹果等树种的一个重要害虫,是国内外的植物检疫对象之一。此虫在我省部分地区发生,个别地区有蔓延趋势,必须引起重视。 苹果绵蚜在我省每年发生13代左右,以若虫在树干伤疤、裂缝内及树干基部越冬。5月上旬第一次繁殖,胎生小蚜虫,多在原处扩大群落。5月下旬至6月中下旬第二次繁殖,是全年繁殖的盛期。此时一龄若虫四处扩散,树上病疤边缘和裂缝处形成一个个白环或白团,如挂棉絮,一年生被害枝也多在此时产生肿疣并开裂。7—8月份由于气温较高而抑制其繁殖,使绵蚜的数量大减。9月中旬以后又逐渐增 Aphis gossypii is one of the important pests that damages the apple and other tree species and is one of the objects of plant quarantine both at home and abroad. The insects occurred in some areas of our province, some areas have the tendency to spread, we must pay attention. Apple aphid occurred in our province about 13 generations a year in order to nymphs in the trunk scars, cracks and the trunk of the trunk of the winter. The first breeding in early May, viviparous small aphids, and more in the same place to expand the community. The second breeding in late May to late June is the annual breeding season. At this point of age, nymphs spread around the edge of the tree scar and cracks at the formation of a white ring or white group, such as hanging cotton floss, annual victim branches also produce at this time more than the warts and cracking. The number of cotton aphids was greatly reduced in July-August due to the higher temperature which inhibited its reproduction. After mid-September and gradually increased