近年来,核桃瘤蛾(核桃毛虫)在北京房山县山区发生,主要以幼虫为害叶片,食成网状,严重时也取食幼果,并造成部分顶芽在当年秋季第二次抽梢和开花,消耗大量养分,使树在冬季易受冻害。 此虫一年发生两代。9月上旬开始,就有老熟幼虫下树找梯田壁、石缝作茧越冬。第二年5月下旬才开始羽化。当幼虫下树过冬时,可喷六六六在距 In recent years, the walnut tumor moth (walnut caterpillar) occurs in the mountainous area of ​​Fangshan County in Beijing. It mainly larvae damage the leaves, food into a network, in severe cases, feeding young fruit, and cause some of the top bud in the fall of the second shoot and Flowering, consume a lot of nutrients, making the tree susceptible to frost damage in winter. This worm occurs two generations a year. Beginning in early September, there are mature larvae find trees under the tree wall, stone crepe for winter. The second year in late May began to emerge. When the larvae survive the winter tree, spray six six six in the distance