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二化螟(Chilo suppressalis Walker)是我国最严重的水稻害虫之一,党中央把它列为7～12年内要求消灭危害的作物害虫。在防治和测报二化螟的工作中,对其幼虫各龄的辨别还存在缺乏理性依据的困难;特别是我国应用化学方法防治螟虫以来,要求掌握防治适期和预报发育进度,更必须掌握龄期认别的方法。
Chilo suppressalis Walker is one of the most serious rice pests in our country. The Central Party Committee lists it as a crop pest that requires the elimination of hazards within 7-12 years. In the prevention and control of rice stem borer in the work of its larvae of each age there is a lack of rational basis for the lack of rationale for difficulties; especially in our country since the use of chemical methods to control stem borers, control of the right to forecast and forecast development progress, but also must master the age Period of recognition of the method.