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据初步调查,我省苹果食心虫主要是梨小食心虫(Grapholitha molesta Busck),我省蓬溪、南川、成都、金堂、理县、汶川、茂汶等县、市均有发生。梨小以幼虫蛀食苹果、梨、桃,李、杏等果实及新梢。据1974年调查,蓬溪县青苹、红苹、彩苹虫果率分别为52％、11％、49％,南川县青苹虫果率达76％。果子被害后生长缓慢,易落,品质变劣,影响内销外贸;新梢被蛀食后枯折,影响树冠的形成及果树的生长发育。梨小食心虫的为害,成为我省果树生产中的一个严重问题。
According to the preliminary investigation, the apple moth worms in our province are mainly Grapholitha molesta Busck, and the counties and cities of Pengxi, Nanchuan, Chengdu, Jintang, Li County, Wenchuan and Maobeng in our province have occurred. Pear small to eat larvae, pears, peaches, plums, apricots and other fruits and shoots. According to a survey conducted in 1974, the rates of green apple, red apple and colored apple in Pengxi County were 52%, 11% and 49% respectively, and the rate of green apple and fruit in Nanchuan County reached 76%. After the fruit was killed, its growth was slow and easy to fall, the quality was deteriorated, affecting the domestic and foreign trade. After being eaten, the shoots were decimated, affecting the formation of canopy and the growth and development of fruit trees. Pear mung bean injury, become a serious problem in the production of fruit trees in our province.