棉蚜趋绿性及田间爬行扩散规律研究

Study on Crawling Expansion Rule and Greentaxis of Cotton Aphid(Aphis gossypii G. )in Cotton Field

用实验手段证实棉蚜在爬行扩散中存在趋绿性,并用超绿性解释棉蚜株行间爬行扩散速率的差异。用经百分比转换后的平均邻差密度的倒数来表示扩散速率。用此速率对大田12小区2次调查的资料进行了扩散规律分析。其结果为;(1)随种群密度增加,株行间扩散速率呈线性上升;(2)株间扩散比行间扩散要快;二者速率呈线性关系。

The greentaxis is confirmed to be presented in the crawling expansion of cotton aphid by experiemental method. The difference of crawling expansion rate between in-rows and inter-rows is explained by the greentaxis. The reciprocal of the mean difference between the percentage densities of neighbouring cotton plants is used to express the expansion rate. The expansion rule is analysed by this rate using the data investigated in 12 little areas for 2 times. The results of analysis are that:(l)the expansion rates of in-rows and inter-rows increase linearly with the population density. (2)The crawling expansion of in-rows is more fast than that of inter-rows. And the relationships between the expansion rates of them are linearity.