菜缢管蚜在油菜苗期田间空间分布型的初步研究

菜缢管蚜是甘蓝型油菜苗期的主要害虫,对菜苗越冬和产量影响很大。本文利用三种分布型的频次拟合测定,扩散型指数及平均拥挤度—平均密度系数和Taylor指数等方法研究菜缢管蚜在油菜苗期的田间分布型,得出其分布属聚集分布;同时利用蚜株率估算平均每株蚜量和百株受害叶片数,简化抽样。这对提高测报效率和准确性有一定的意义。

The Spatial Distribution Patterns of Lipahis Erysimi Psendobrassicae During the Seedling Stage of Rape (Brassical napus).

It has an effect on the rape hibernation and makes the rape yield reduced. The indices of aggregation, mean crowding—meandensity coefficint and Taylor index were led into the study of spatial patterns of the rape aphis during rape seedling stages. All indices indicate that the distribution of the rape aphis was of an aggregation pattern. Using the percentage of aphis plant estimates the average of aphis quantity of every plant and green leaf blades harmed of per hundred plants. This make the sample investigation simplfied. It is a certain effect which increases the efficiency and the accuracy of forecasting for the rape aphis.