梨小食心虫简称梨小,是几种为害桃果害虫中最重的一种。在防治不力的桃园中,中晚熟品种虫果率很高,可达50％以上,其产量和品质都会受到影响。 该虫一、二代主要为害桃梢,三、四代为害梨、桃果实。三、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 Pear small heart pest called Pear small, is the pest damage of several pests in one of the most important. In the poor prevention and control of Taoyuan, late-maturing varieties of fruit and insect pests is very high, up to 50% or more, its output and quality will be affected. The insects, the second generation of the main damage peach shoots, three or four generations of pear, peach fruit. Three or four generations of mature larvae in the cracks in the tree, Alice and other places cocoon wintering, wintering cocoon at the base of the trunk near the surface at most. The second spring of April pupation on the mid-early, overwinter generation adults generally appear