庆阳地区现有果园4590个,栽植各种果树2050万株,年产果品3433万余斤。由于果园的管理技术跟不上生产发展的需要,病虫害孳生蔓延,尤以食心虫危害最为普遍,有的果园所产果实,甚至到了十果九蛀的程度。如1979年南小河沟试验场调查,红元帅、青香蕉、黄元帅三个品种的虫果率平均为90.72％。食心虫在当地危害苹果、梨、桃、杏、李、枣、花红等果实。其种类有桃小、苹小、梨小、白小、苹异银蛾、梨大六种,尤以桃小危害最烈,是食心虫的优势种群,占80％以上(见表)。从表中还 4590 existing orchards in Qingyang Prefecture, 20.5 million trees planted with various kinds of fruit, with an annual output of 34.33 million kilograms of fruit. As orchards management techniques can not keep pace with the needs of production and development, the spread of pests and diseases, especially the most common hazards of moth worms, fruit production in some orchards, and even to the extent of ten fruit and nine moths. As 1979 Nanxiaohegou pilot field survey, Red Marshal, Green Banana, Huang Marshal three varieties of fruit average rate of 90.72%. Moth worms in the local endanger apples, pears, peaches, apricots, plums, dates, bonuses and other fruits. The species are peach small, small apple, pear small, white small, silver moth, pears six kinds, especially peach small most damaging, is the dominant population of borer, accounting for more than 80% (see table). Also from the table