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依据和目的天敌控制特别是占捕食性天敌80％的农田蜘蛛,是抑制害虫猖獗的重要因素。徐州地区农科所报导,当蛛虫比值在6.4以上时,能有效地抑制稻纵卷叶螟的为害,田间卷叶率可控制在2.25—6.88％之内(1980)。湖南师范学院生物系和湘阴县报导,早、中、晚稻稻飞虱,一般蛛虫比在1:4—1:9以内,可不必用药防治。同时指出控制用药,保护了蜘蛛,也同时保护了其他天敌(1983)。但是长期以来,由于有机氯农药的大量使用,使害虫产生了抗药性,对天敌的杀伤力和对环境污染而逐步停用,被其他有机磷、有机氮和仿生农药所取代。当前在水稻害虫防治时,对杀虫剂的选择,既要着眼于对害虫有较高的防治效果,又
Basis and purpose Natural enemies control farm spiders, which account for more than 80% of predatory natural enemies, as an important factor in suppressing pest infestations. Xuzhou Agricultural Department reported that when the arachnoid ratio above 6.4, it can effectively inhibit the damage of the rice leaf roller, leaf curl rate in the field can be controlled within 2.25-6.88% (1980). Hunan Normal University Department of Biology and Xiangyin County reported early, middle and late rice planthoppers, the general aphid ratio than 1: 4-1: 9, may not need medication control. At the same time, it is pointed out that the control of medication, the protection of spiders, while also protecting other natural enemies (1983). However, for a long time, due to the large-scale use of organochlorine pesticides, pests have become resistant, their lethality to natural enemies and the gradual deactivation of the environment have been replaced by other organophosphorus, organic nitrogen and biomimetic pesticides. At present, in the pest control of rice, the choice of pesticide should not only focus on the prevention and control of pests, but also