Studies on Repelling Activity of Extracts from Chromolaena Odorata L. Against Plutella Xylostella l.
飞机草提取物对小菜蛾产卵驱避活性的研究。
2
The indices of aggregation indicate that the larvae and pupae of plutella xylostella present aggregated distribution in the field.
聚集度指标检验结果显示，幼虫、蛹在田间呈聚集分布。
3
Using the method of relational grade of grey system, the abiological factor influencing Plutella xylostella population from 1991 to 1995 were analyzed.