梨树蚜虫以梨二叉蚜为主,在河北省各梨区普遍发生,是果树的主要害虫之一。 梨蚜以成虫、若虫危害叶片,被害叶片正面纵卷成筒状,致使叶片不能展开,最终形成枯斑而脱落,从而削弱树势,影响梨树的生长发育。 梨蚜以早春危害嫩叶,造成损失最大,各地都以喷药防治蚜虫,但这种防治方法不仅污染环境 Pear tree aphid mainly Pear two aphids, Pear in Hebei Province generally occur, is one of the major pests of fruit trees. Pear aphids to adults, nymphs endanger the leaves, the victim leaves the front vertical roll into a tube, resulting in leaves can not start, the final formation of dead spots and fall off, thus weakening the tree potential, affecting pear growth and development. Pear aphids to harm young leaves in early spring, causing the greatest loss, all around the spray to control aphids, but this prevention and treatment methods not only pollute the environment