论文部分内容阅读
了解害虫种群的田间分布型,掌握抽样技术,能正确省时地估计虫口密度,被害程度,对防治害虫有重要的指导作用。1978～1979年,我们对棉红蜘蛛为害后产生的红叶在棉田的分布型及其抽样技术作了调查研究,现报告如下。 (一)调查方法 6月中～7月初,选择不同长势,不同类型的棉田进行调查。1978年调查4块,每块连续调查25行,每行40株;79年调查9块,
Understanding the distribution pattern of pest population in the field and mastering the sampling technique can correctly estimate the population density and degree of insect population in a timely manner and have an important guiding role in pest control. From 1978 to 1979, we investigated the distribution patterns and sampling techniques of red leaves in the cotton field after the damage caused by spider mites. We report the following findings. (A) of the survey method From mid-June to early July, choose different growing conditions, different types of cotton fields to investigate. In 1978, there were 4 surveys, each of which consisted of 25 surveys of 40 lines each with 40 lines. In the 79-year survey, 9 were found,