转基因棉花对棉铃虫天敌寄生率的影响

采用分期接虫、分期回收法研究常规棉与转基因棉花品种 (系 )上棉铃虫寄生性天敌在不同棉花品种上的寄生作用。结果表明 ,无论是第 2代棉铃虫发生期间还是第 3 ,4代棉铃虫发生期间 ,无论是棉铃虫卵期还是幼虫期 ,转基因棉花品种 (系 )的棉铃虫卵、幼虫寄生率均显著低于常规棉花品种上的寄生率。棉铃虫卵期寄生蜂主要是拟澳洲赤眼蜂 ,幼虫寄生蜂为棉铃虫齿唇姬蜂等。由此看出转基因棉对棉铃虫寄生性天敌存在非亲和性。

Effect of Bt transgenic cotton on parasitism of cotton bollworm.

Parasitism of cotton bollworm (Helicoverpa armigera) was investigated in fields of Bt transgenic cotton and non-transgenic cotton in Yangzhou of Jiangsu Province. Trichogramma confusum was the main egg parasitoids, and Campoletis chlorideae was the main larval parasitoids. The results showed that Rates of parasitized eggs and larvae of cotton bollworm were notably lower on the Bt trangenic cotton than those on the non-transgenic cotton. The incompatibility of parasitoids and Bt transgenic cotton was suggested.