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梨小食心虫(Grapholitha molesta Basck)属鳞翅目小卷叶蛾科,分布全国各地。该虫主要以幼虫危害梨、苹果、杏、桃、李等树种的果实和新梢。近年来,梨小食心虫在甘肃省张掖地区部分梨园均有发生,成灾面积越来越大。本区已有梨园2万hm~2,主栽品种为苹果梨,进入盛果期梨园占50％。遭受梨小食心虫危害梨园,一般虫果率达25％～35％,严重时可达75％以上,经济损失达45％以上。为减少因梨小食心虫危害而造成的经济损失,我们在1992～1998年对梨小食心虫的综合防治技术进行了研究。
Grapholitha molesta Basck is a family of Lepidopterania, distributed throughout the country. The insects mainly larvae damage pear, apple, apricot, peach, plum and other tree species of fruit and shoots. In recent years, Pear Mungbean insects in Zhangye Prefecture, Gansu Province, some pear orchard have occurred, increasing disaster area. This area has 20,000 orchards 20,000 hm ~ 2, the main cultivars of apple pear, pear orchard into the full fruit accounted for 50%. Pear suffer from pear heartworm Pear, the general rate of 25% to 35% of fruit, in severe cases up to 75%, economic losses of 45% or more. In order to reduce the economic loss caused by the harm of the pear borer, we studied on the comprehensive prevention and control technology of the borer borer from 1992 to 1998.