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雁北是个新梨区,全区约有梨树30余万株。近年来,随着梨树进入结果期,梨果产量大幅度增长,群众对梨树栽培越来越重视。然而,由于对梨大食心虫缺乏认识,又没有防治经验,致使这一害虫普遍发生且日趋严重。据朔县,怀仁、大同、阳高等县调查,果实被害率平均15—26.5％,个别园高达87.2％,花芽被害率也在20—40％之间,严重地影响产量。为了尽快控制其为害,1982—1983年,我们在阳高县王官屯公社南
Yan North is a new pear area, the region about more than 30 million pear trees. In recent years, with the arrival of the pear tree in the fruiting period, the output of pears has risen sharply and the masses have paid more and more attention to the cultivation of pear trees. However, due to the lack of understanding of the pest and the lack of prevention and control experience, the pest has become widespread and aggravating. According to Shuo County, Huairen, Datong, Yanggao County investigation, the average rate of fruit damage was 15-26.5%, individual garden up to 87.2%, flower bud damage rate is also between 20-40%, seriously affecting the yield. In order to control its damage as soon as possible, 1982-1983, we Yanggao County, Wang Guantun commune south