苹果全爪螨(Panonychus ulmi Koch)又称短腿红蜘蛛,为本地苹果园主要害虫之一。我们于1987—1991年在沂源、平邑、临沭、临沂等县苹果园设点进行了系统观察和试验研究,对其发生规律和防治技术进行了探讨,现将结果整理如下:1 发生规律1.1 越冬种的孵化进程苹果全爪螨在本地一年发生7代,以圆葱状的卵在1—2年生 Panonychus ulmi Koch, also known as short-legged spider mite, is one of the major pests in native apple orchards. In 1987-1991 we systematically observed and experimentally studied the establishment of apple orchards in Yiyuan, Pingyi, Linshu and Linyi counties, and discussed their occurrence and prevention technologies. The results are summarized as follows: 1 The law of occurrence 1.1 Overwintering species of hatching process Apple mites in the local occurrence of 7 generations a year, with onion-shaped eggs in 1-2 years of age