浙南地区豆野螟生物学特性和消长规律研究

经室内饲养和田间调查明确,豆野螟在浙南地区一年发生7～8代,第8代为不完全代。一年中在6月下旬、7月中下旬、8月上中旬、9月中旬、10月上中旬均有明显的发生高峰,呈现波浪多峰型的发生特点,世代重叠严重,2、3、4、5各主害代之间危害程度相差不大。豆野螟在自然变温条件下卵的发育起点温度和有效积温分别为10.84℃和53.17日度,幼虫的发育起点温度和有效积温分别为7.84℃和214.90日度,蛹的发育起点温度和有效积温分别为9.48℃和124.41日度。

Biological characteristics and occurrence regularity of the legume rod-borer Maruca testulalis Geyer in Southern Zhejiang

Maruca testulalis Geyer occurs eight generations in Southern Zhejiang each year, and the eighth generation is incomplete.There are distinctly high peaks in the last ten days of June, in the last twenty days of July, in the first twenty days of August, in the middle ten days of September and in the first twenty days of October, respectively.The generations occurred undulatingly and overlap with each other. It was found that there were no obvious distinction between the damage degrees of the second, third, fourth and fifth generations.Different development periods of M. testulalis under different natural temperatures have been studied in this paper.The results showed that the development threshold temperatures for eggs, larvae and pupae were 10.84℃, 7.84℃ and 9.48℃, respectively, while the effective accumulated temperatures for eggs, larvae and pupae were 53.17 degree-day , 214.90 degree-day and 124.41 degree-day, respectively.