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梨星毛虫又名饺子虫,在平凉地区每年发生一代,以二龄幼虫在翘皮下越冬,四月中旬出蛰,为害刚萌动的果树花芽,五月中旬开始将叶纵卷呈饺子状,幼虫在内啃食叶肉。一头幼虫可为害2—4片树叶,受害严重时,树体所有叶片全被吃光。我们从以下几方面对梨星毛虫进行综合防治,大大减轻了梨星毛虫的为害程度:1.四月份以前刮除树干及大枝的老皮,可消灭一大部分越冬幼虫。2.早春在梨星毛虫出蛰盛期,喷布稀释1000倍的敌敌畏或其它触杀剂。
Pear cinnabar, also known as dumplings worms, occurs in Pingliang area every year to second-instar larvae wintering in the warped, sting out in mid-April, the damage just sprouting fruit tree flower buds, beginning in mid-May leaf dumplings were dumplings, larvae Gnaw the mesophyll inside. A larvae can damage 2-4 leaves, severe damage, all the leaves of the tree were eaten. We are from the following aspects of pear caterpillars comprehensive prevention and control, greatly reducing the pear caterpillar harm degree: 1. April before the removal of the trunk and large branches of the old skin, can eliminate a large part of the overwintering larvae. 2. In early spring pear star caterpillar out of the heyday, spray 1000 times diluted dichlorvos or other touch agent.