常规棉花粉和转Cry1Ac+CpTI棉花粉对拟澳洲赤眼蜂繁殖和存活的影响

在室内评价了常规棉花粉和转Cry1Ac CpTI棉(Bt棉)花粉通过不同处理方式作为食物源对拟澳洲赤眼蜂Trichogrammaconfusum寿命、寄生卵数、子代羽化数和性比等繁殖和存活特征的影响。共设计7个饲喂处理,即不饲喂(UNFED)、水(W)、水 常规棉花粉(W P)、水 Bt棉花粉(W BtP)、10%蜂蜜水(H)、10%蜂蜜水 常规棉花粉(H P)和10%蜂蜜水 转Bt棉花粉(H BtP)。在提供或不提供米蛾Corcyracephalonica卵条件下,经W P或W BtP饲喂的雌蜂寿命与W或UNFED间无显著差异,但均显著短于H和H P或H BtP饲喂的雌蜂,而经H P或H BtP饲喂的雌蜂寿命又均显著长于经H饲喂的雌蜂(p<0.05)。比较每雌寄生卵数和子代羽化数来看,各处理明显分为3类,即UNFED、W、W P和W BtP为最低,H为居中,H P和H BtP为最高。比较每雌子代性比来看,各处理也明显分为3类,即H、H P和H BtP为最低,W P和W BtP为居中,UNFED和W为最高。饲喂W P和W BtP的雌蜂寿命、寄生卵粒数、子代羽化数和性比分别与W BtP和H BtP饲喂间无显著差异(p<0.05)。因而,棉花花粉需与蜂蜜组合才能成为拟澳洲赤眼蜂实现其最大存活和繁殖力的食物;Bt棉花粉对拟澳洲赤眼蜂无影响。

Effect of pollen of conventional cotton and transgenic Cry1Ac+CpTI cotton on reproduction and survival of the parasitoid wasp Trichogramma confusum Viggiani(Hymenoptera: Trichogrammatidae)

The cotton bollworm, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae), is the most important pest of cotton in China, causing both quantitative and qualitative losses. Trichogramma confusum Viggiani (Hymenoptera: Trichogrammatidae) is an endemic egg parasitoid of cotton bollworm H. armigera in China and is a potential biological control agent. The availability and quality of food played an important role in determing the effectiveness of parasitoids as control agents. Adult Trichogramma spp. are known...