论文部分内容阅读
在调查赤眼蜂防治玉米螟效果或卵自然寄生率时,常用卵块寄生率和卵粒寄生率两个指标。卵块寄生率调查速度快,适合大面积、多处理的效果调查对比,能在较短时间内完成调查任务,但其缺点是不能确切反映实际寄生情况。卵粒寄生率是确切的寄生指标,但田间调查速度慢,工效低,不适合大面积的、群众性的调查。为了解决这个矛盾,我们分析了(1974～1977年)连续四年在河南省兰考县各公社调查的资料,发现卵块寄生率与卵粒寄生率之间有着密切的相关关系,提出了用卵块寄生率估计卵粒寄生率的办法。
In the investigation of Trichogramma ostriniae effect or the natural parasitic eggs, parasites and egg parasitic rate of two indicators. Ovum parasitism survey speed, suitable for large area, multi-processing comparison of the results of the survey can be completed within a relatively short period of investigation mission, but its shortcomings can not accurately reflect the actual parasitic conditions. Oviposition rate is the exact parasitic index, but the field investigation is slow, inefficient, not suitable for large-scale, mass survey. In order to solve this contradiction, we have analyzed the data of the communes in Lankao County, Henan Province (from 1974 to 1977) for four consecutive years and found that there is a close correlation between the egg mass parasitism and the egg mass parasitism rate. Estimation of the rate of egg parasitism.