少数刺吸类害虫为害梨和苹果。它们吸取叶芽、子房、果实、小枝和新梢的汁液,结果引起落叶、落花、子房脱落、新梢畸形、小枝干枯和整个树势变弱。现在我们叙述一下许多果区常见的害虫——梨黄木虱和桔紫身(牜厉)蚧。梨黄木虱分布在苏联欧洲部分,分布北界为爱沙尼亚和列宁格勒州,也见于中亚,特别在克里木和高加索严重为害梨树。在木虱大发生时,在叶片和果实上粘有分泌物,并常滋 A few spiked pests damage pears and apples. They draw juice from leaves buds, ovaries, fruits, twigs, and shoots, causing deciduous leaves, falling flowers, shed ovaries, abnormal shoots, dry branches, and weakening of the entire tree. Now let’s talk about the pests that are common in many fruit growing areas - pear psylla and jacaranda. Pear yellow psyllid is distributed in the European part of the Soviet Union, distributed in the northern boundary of Estonia and Leningrad, also found in Central Asia, especially in Crimean and Caucasus. In the big occurrence of psylla, sticky secretions on the leaves and fruits, and often Zi