一、危害情况1.梨大食心虫的危害情况梨大食心虫主要以幼虫蛀食梨花芽和梨幼果,偶尔也危害桃和苹果等,有转芽和转果危害的习性。越冬幼虫于越冬前和翌春危害梨花芽,从芽的基部蛀入,直达髓部,虫孔外有细小虫粪,有丝缀连,被害芽瘦。越冬后的幼虫转芽危害时,先在芽鳞内吐丝缠缀鳞片,使鳞片不能脱落。梨大在花序分离期则危害花序,被害花丛常全部调萎,梨芽被害后不能开放。坐果后蛀食幼果,蛀果孔外有虫粪,并吐丝缠绕果柄,尤其在接近化蛹时,被害梨 First, the damage situation 1. Harmful situation of Pear Gourd Pear Gourd Pear mainly eaten Pear buds and pear young fruit, and occasionally endangered peaches and apples, have the habit of buds and turn harm. Overwintering larvae in the winter before and next spring endanger pear buds, buds from the base of the bores, direct access to the medulla, wormhole excrement of small insect excrement, with silk gagged, victim bud thin. After overwintering the larvae turn bud damage, the first scale sprout silkworm scales, so that scales can not fall off. Pear large inflorescence in the inflorescence of the season, the flowers are often all wilting damage, pear buds can not be opened after the victims. Fruit after eating young fruit, moth bore fruit wormhole excrement, and silk wrapped around the stalk, especially in close to pupation, the victim pear