Wang Desen, Lü Lihua, He Yurong, Shi Qingxing, Wang Guohong
Key Laboratory of Bio-Pesticide Innovation and Application of Guangdong Province, Department of Entomology, College of Agriculture, South China Agricultural University, Guangzhou, Guangdong Province 510642, China (
Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, Guangdong Province 510640, China (
J Econ Entomol. 2016 Dec;109(6):2380-2387. doi: 10.1093/jee/tow220. Epub 2016 Oct 23.
Trichogramma chilonis Ishii is an important natural enemy of many lepidopterous pests on various crops. Effects of two conventional insecticides on oviposition and host discrimination behavior in T. chilonis were evaluated in the laboratory through video tracking. During the oviposition period, when the number of host eggs was limited (only one host egg), females exposed to beta-cypermethrin LC or LC exhibited significantly higher feeding and re-drilling rate and significantly longer post-oviposition duration than control females. Spinosad LC treatment not only decreased the wasp oviposition rate but also significantly extended the oviposition duration. When the number of host eggs was six, similarly, females exposed to spinosad LC exhibited a significantly lower oviposition rate (79.2%) than control ones (100%). In the host discrimination experiment, females exposed to LC of both tested insecticides (beta-cypermethrin and spinosad) spent significantly more time on the extra-patch area. The females that survived spinosad LC could not discriminate between unparasitized and parasitized host eggs. Our study suggests that even the LC and LC of the tested insecticides had negative effects on the oviposition and host discrimination behavior of T. chilonis Thus, the use of these two insecticides should be carefully evaluated.
稻螟赤眼蜂是多种作物上许多鳞翅目害虫的重要天敌。通过视频跟踪在实验室评估了两种常规杀虫剂对稻螟赤眼蜂产卵和寄主识别行为的影响。在产卵期，当寄主卵数量有限（仅一个寄主卵）时，接触高效氯氰菊酯LC或LC的雌蜂表现出显著更高的取食和再钻孔率，且产卵后持续时间显著长于对照雌蜂。多杀菌素LC处理不仅降低了赤眼蜂的产卵率，还显著延长了产卵持续时间。当寄主卵数量为六个时，同样地，接触多杀菌素LC的雌蜂产卵率（79.2%）显著低于对照雌蜂（100%）。在寄主识别实验中，接触两种受试杀虫剂（高效氯氰菊酯和多杀菌素）LC的雌蜂在斑块外区域花费的时间显著更多。在多杀菌素LC中存活下来的雌蜂无法区分未寄生和已寄生的寄主卵。我们的研究表明，即使是受试杀虫剂的LC和LC对稻螟赤眼蜂的产卵和寄主识别行为也有负面影响。因此，应谨慎评估这两种杀虫剂的使用。
