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查清二化螟田间虫口密度、发育进度、为害损失率,是预测一个地区二化螟发生期、发生量、为害程度,以及制定治螟方案和验证防治效果的可靠依据。二化螟的生存活动有一定的规律性,但由于环境因子影晌,常常变化很大,因此,调查时除掌握一般的调查技术外,对千变万化的情况,要加以考虑分析。下面就作者十年来在调查工作中的一些体会,提出来同大家讨论。
It is a reliable basis for predicting the occurrence, occurrence and damage of Chilo suppressalis in a region in order to find out the population density, developmental progress and damage loss rate of Chilo suppressalis in the field. Stem Borer survival activities have a certain regularity, but due to environmental factors, often vary greatly, therefore, the survey in addition to master the general survey techniques, the ever-changing situation to be considered and analyzed. The following author in the investigation of the past 10 years some experience, put forward to discuss with you.