梨小食心虫是危害桃果害虫中最重的一种,在防治不力的桃园,中、晚熟桃虫果率可达50％以上,其果实品质和产量都将受到严重影响。该虫在华北一年发生3～4代(南部4～5代),一、二代主要危害桃稍,三、四代一般危害梨、桃果实。三或四代老熟幼虫在树体裂缝、翘皮等处结茧越冬,越冬茧在树干基部近地表处最多。第二年春季4月上中旬化蛹,越冬代成虫一般出现在4月中旬至5 Pear Mungbean is the most harmful peach pest in the most one, in the poor prevention and control of Taoyuan, late peach fruit rate of up to 50%, its fruit quality and yield will be seriously affected. The insects occur in North China 3 to 4 generations a year (southern 4 to 5 generations), one or two major hazards Peach slightly, three or four generations of the general hazards pear, peach fruit. Three or four generations of mature larvae in the cracks in the tree, Alice and other places cocoon wintering, wintering cocoon in the trunk near the surface at the most. The second spring of April pupation on the mid-early, overwintering adult generally appear in mid-April to 5