Salerno Gianandrea, Colazza Stefano, Conti Eric
Department of Arboriculture and Plant Protection-Entomology, University of Perugia, Borgo XX Giugno, Perugia 06121, Italy.
Pest Manag Sci. 2002 Jul;58(7):663-8. doi: 10.1002/ps.492.
The lethal doses of the pyrethroid deltamethrin were estimated for the egg parasitoid Trissolcus basalis (Wollaston) (Hymenoptera: Scelionidae), and the sub-lethal effects of an LD25 on female walking behaviour were evaluated. Linear speed of treated parasitoids was reduced compared with that of untreated ones for a period of up to 24 h. The sub-lethal effects of deltamethrin on parasitoid response to patches contaminated by a contact kairomone from its host, Nezara viridula L (Heteroptera: Pentatomidae), was also evaluated. Both treated and untreated parasitoids responded to host-contaminated patches by increasing residence time and decreasing linear speed. However, treated females showed a significantly lower residence time compared with untreated females. Both treated and untreated females showed a similar decrease over time in the proportion of time spent in the host-contaminated patch. Hence, we hypothesise that the sub-lethal effect of deltamethrin on host foraging may decrease T basalis efficacy in controlling N viridula.
估算了拟除虫菊酯溴氰菊酯对卵寄生蜂基底三叉蚜小蜂（沃拉斯顿）（膜翅目：缘腹细蜂科）的致死剂量，并评估了25%致死剂量（LD25）对雌蜂行走行为的亚致死效应。在长达24小时的时间段内，经处理的寄生蜂的直线速度与未处理的相比有所降低。还评估了溴氰菊酯对寄生蜂对来自其寄主稻绿蝽（半翅目：蝽科）的接触性利它素污染斑块的反应的亚致死效应。经处理和未处理的寄生蜂都通过增加停留时间和降低直线速度来对寄主污染斑块做出反应。然而，经处理的雌蜂与未处理的雌蜂相比，停留时间显著更短。经处理和未处理的雌蜂在寄主污染斑块中停留时间的比例随时间推移均呈现出类似的下降。因此，我们推测溴氰菊酯对寄主觅食的亚致死效应可能会降低基底三叉蚜小蜂对稻绿蝽的控制效果。
