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1975年以来,桃小食心虫对平凉地区苹果、梨、桃、杏、花红及枣等果树的为害日趋严重,全区受害面积约占总面积的60％左右。据1983年8月中旬到10月下旬对平凉,灵台,泾川以及华亭四县果园的调查:主要果树的虫果率为37.6—85.7％,苹果中个别品种的虫果率高达95.6％(见表一)。近几年来,有些果园虽进行过药剂防治,但由于对桃小食心虫在我区的发生规律没有模清,防治效果极差。为了给防治时机提供科学依据,我们从1982年到1984年
Since 1975, peach mung worms have become more and more harmful to fruit trees such as apples, pears, peaches, apricots, red flowers and jujube in Pingliang. The area affected by the disease is about 60% of the total area. According to a survey of orchards in Pingliang, Lingtai, Jingchuan and Huating four counties from mid-August to late October 1983, the fruit-fruit rate of major fruit trees was 37.6-85.7%, and that of individual fruit varieties in apples was as high as 95.6% (see Table I). In recent years, although some orchards have carried out chemical control, but because of the Peach moth in the law of occurrence in my area not clear, very poor control. In order to provide a scientific basis for prevention and treatment, we from 1982 to 1984