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水稻食根叶(Donacia provosti F.)是周至县“烂泥田”特有的重要害虫。经两年的研究初步证实这种害虫在周至地区每二年完成一代。稻田的幼虫密度,随田块不同,差异极大。害虫发生的多少与稻田渍水、泥层深度、眼子菜的多寡有密切关系。位于串灌下游的常年渍水田,泥层最深,眼子菜多,虫害也特别严重。成虫对多种药剂都很敏感,稻田泥中施药对杀灭幼虫基本无效,施于泥中的“666”于第五天基本丧失其毒力。根据研究结果认为,改造烂泥团是彻底消灭稻根叶适生地的根本措施。当前应在成虫盛发期喷药防治成虫,压低虫口数量。
Donacia provosti F. is an important pest that is unique to the “muddy fields” in Zhouzhi County. After two years of preliminary study confirmed that pests in the weekend to complete a generation every two years. The density of larvae in paddy fields varies greatly with different fields. The number of pests and paddy waterlogging, mud depth, the size of eye food is closely related. Perennial paddy fields located in the downstream of paddy fields, the deepest layer of mud, eye food more pests are particularly serious. Adult insects are sensitive to a variety of pesticides. In the paddy soil, application of pesticides is basically ineffective to kill larvae. The “666” applied to the mud basically loses its virulence on the fifth day. According to the results of the research, it is considered that the transformation of the sludge mass is the fundamental measure to completely eliminate the habitat of the rice roots and leaves. At present, adults should be sprayed with pesticides to control the number of insects during the vigorous development of adults.