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我大队是个老梨区,梨大食心虫是危害我区梨果生产的主要害虫之一,它不但危害花芽,还危害花丛和幼果,造成严重减产。1972年开始,我队生防所对梨大食心虫的生活规律进行了研究。通过几年观察,发现梨大食心虫在我地区一年发生一代,幼虫危害花芽3—4个、幼果2—3个。在饲养过程中,我们又发现梨大食心虫的幼虫和蛹,被天敌大量寄生。有6种寄生蜂、2种寄生蝇,寄生率高达90—95%。为了利用天敌防治梨大食心虫,我们具体采用了查、洗、
My brigade is an old pear district. Pear is one of the major pests that endanger the production of pear fruit in our district. It not only endangers flower buds but also harms flower and young fruit, causing serious cuts. Since 1972, our team has conducted a study on the law of life of Pears. After several years of observation, it has been found that the pear borer occurs one generation a year in our area. The larvae endanger 3-4 buds and 2-3 young fruits. During the rearing process, we also found that the larvae and pupae of the large pear borer were parasitized by predators. There are 6 kinds of parasitic wasps, 2 kinds of parasitic flies, parasitic rates as high as 90-95%. In order to use natural enemies Pear control worm, we specifically use the check, wash,