苹果根绵蚜的症状与防治１为害症状为害叶部时多在叶背的边缘，使叶片向背部卷，为害根部时，多在毛根上，受害的毛根周围常有许多白色蜡质絮状物，在根部的为害症状与苹果绵蚜相似，区别是根绵蚜为害后的毛根不形成瘤状物。２发生规律苹果根绵蚜在我区１年发生９代，以卵... Symptoms and control of aphids in apple root 1 Damage symptoms When the leaves are often at the edge of the leaf back, so that the leaves to the back of the volume, root damage, mostly in the hair root, the victim hair root often around many white waxy floc , At the root of the symptoms of harm and apple aphid similar, the difference is the root of aphid hairy root does not form a tumor. 2 occurrence of apple root aphid occurred in our district 9 years to egg ...