苹果根爪绵蚜是在苹果树根梢为害的重要新害虫 ,梨九绵蚜和榆绵蚜是在梨树根梢为害的重要新害虫。 6～ 9月份 ,这 3种绵蚜为害果树根部。根据防治试验、示范结果 ,春季在绵蚜迁入之前 ,采用果园全田覆盖地膜的办法 ,可阻隔其入土 ,进而可使果树根部全年免受其为害 ;夏季在绵蚜为害期 ,采用磷化铝地下熏蒸的办法 ,杀虫效果明显 Apple aphid Aphid is an important new pest damage in the apple tree shoots, Pear nine cotton aphid and cotton bud aphid is harmful to pears root tips important new pests. 6 ~ September, these three kinds of cotton aphids harm the roots of fruit trees. According to the prevention and control tests and demonstration results, before the cotton aphids moved into the spring, the whole orchard covered with plastic film could be cut off from the soil to prevent the root of fruit tree from being damaged throughout the year. In summer, Aluminum underground fumigation approach, insecticidal effect is obvious