梨树从新梢开始至果实收获,始终受到梨木虱危害,它吮吸嫩叶汁液,分泌粘液,使叶片、果实表面出现黑色霉菌层叶片早脱,果实小品质差,枝条生长停顿,冬季易受冻害。由于梨木虱危害期长,难以防治,在防治策略上应注意两点。1 抓住出蛰期防治 Pear tree from the shoots to the fruit harvest, pear lice always be harmed, it sucks the leaves juice, mucus secretion, so leaves, the fruit surface black mold layer leaves early off, the poor quality of the fruit, branches standstill, the winter vulnerable Frost damage. Due to long-term harm of pear psylla, it is difficult to prevent and control. In prevention and control strategies, two points should be noted. 1 seize the prevention and treatment of sting