小菜蛾绒茧蜂的寄生效能

在温度为（２７±１）℃，相对湿度为（７５±５）％的实验室条件下，研究了小菜蛾绒茧蜂（ＣｏｔｅｓｉａｐｌｕｔｅｌａｅＫｕｒｄｊｕｍｏｖ）对不同密度下的小菜蛾幼虫（３龄为主）的功能反应及自身密度的干扰反应．根据试验结果，分别用Ｈｏｌｉｎｇ圆盘方程和Ｈａｓｓｅｌ－Ｖａｒｌｅｙ模型进行拟合，并建立其功能反应方程为Ｎａ＝０．９２９５Ｎ／（１＋０．０９１８Ｎ），自身密度的干扰反应数学模型为ａ＝０．１４３５Ｐ－０．４９８７．结果表明：小菜蛾绒茧蜂对小菜蛾幼虫密度的寄生效应属ＨｏｌｉｎｇⅡ型，小菜蛾绒茧蜂随着自身密度的增加，其寄生效果呈下降的趋势．在此基础上，讨论了小菜蛾绒茧蜂与小菜蛾之间的相互关系及其生物学意义

Parasitical efficiency of Cotesia plutellae Kurdjumov(Hymenoptera:Braconidae)

The parasitical efficiency of Cotesia plutellae Kurdjumov were studied under the experimental condition of (27±1)℃ and (75±5)% RH.The functional response of Cotesia plutellae Kurdjumov to the third instar larvae of the diamondback moth, Plutella xylostella L. can be fitted with Holling′s type Ⅱ, which was described by Holling disc equation Na=0.9295N/(1+0.0918N); the mutual interference among parasite individuals could be simulated by Hassell Varley′s model a=0.1435P 0.4987.Based on the above studies, the relation between Cotesia plutellae Kurdjumov and Plutella xylostella L. and its bionics significance were discussed.