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杏球坚介壳虫(Didesmococcus ko-reanus Borchs)在我省河西走廊普遍发生,它主要危害杏、桃、苹果、梨等果树,是果树枝干上的重要害虫。据调查,1983—1984年该虫猖獗发生,张掖小满乡五星六队杏树枝条上每平方厘米内有虫17头,致使枝条干枯,树势严重衰弱,产量急剧下降。一、形态特征成虫:雌成虫近乎球形,后端直截,前端和身体两侧的下方弯曲,直径3—4.5毫米,初期介壳质软,黄褐色,后期硬化为红
Didesmococcus ko-reanus Borchs is common in the Hexi Corridor in our province. It mainly harms the fruit trees such as apricot, peach, apple and pear and is an important pest on the branch of fruit tree. According to the survey, the worm occurred rampant in 1983-1984. There were 17 insects per square centimeter on the apricot branch of Zhangye Small Manxiang Township. As a result, the shoots withered, the tree vigor seriously weakened, and the output dropped drastically. First, the morphological characteristics Adult: adult female nearly spherical, back straight, front and sides of the body below the bend, 3-4.5 mm in diameter, early hypochloremia, brown, reddening later red