School of Energy and Environmental Science, Yunnan Normal University, Kunming, China.
J Environ Sci Health B. 2013;48(8):651-7. doi: 10.1080/03601234.2013.778597.
This study focuses on assessing the impact of sublethal doses of paraquat on the survival, the emergence, the life span and the parasitic behavior of Diaeretiella rapae M'Intosh (Hymenoptera: Braconidae). The impact of sublethal doses was measured at room temperature using different densities of the cabbage aphid Brevicoryne brassicae. The results reveal that the field dose of paraquat caused 100% mortality in D. rapae. The percentage emergence of D. rapae decreased from 80.5% in the control group to 71.5% when treated with the lowest concentration of paraquat. Similarly, the life span of parasitoids that emerged from the mummy treated with paraquat also decreased significantly. Oviposition capability and ovipositor thrusting frequency of D. rapae also treated with sublethal dose paraquat decreased significantly along with a shortened patch residence time in the foraging area.
本研究旨在评估百草枯亚致死剂量对小菜蛾啮小蜂（膜翅目：姬蜂科）的存活率、羽化率、寿命和寄生行为的影响。在室温下，使用不同密度的菜蚜 Brevicoryne brassicae 来衡量亚致死剂量的影响。结果表明，百草枯田间剂量可导致小菜蛾 100%死亡。与对照组的 80.5%相比，用最低浓度的百草枯处理后，小菜蛾的羽化率降至 71.5%。同样，从用百草枯处理过的木乃伊中羽化的寄生蜂的寿命也显著降低。小菜蛾的产卵能力和产卵器刺击频率也随着觅食区驻留时间的缩短而显著下降。
