Abstract
Abstract The effects of gossypol, an important allelochemical in cotton, on growth of the cotton bollworm Helicoverpa armigera (Hubner) and development of its endoparasitoid Campoletis chlorideae (Uchida) in Huanghe River Valley were studied. Growth of H. armigera larvae was accelerated by adding 0.1% gossypol in the artificial diet, causing 10.75% reduction of the vulnerable period to C. chlorideae while the suppression activity of 0. 5 % gossypol to H. armigera larvae prolonged the vulnerable period by 28.15%. Negative effects of gossypol on the development of the parasitoid were demonstrated by using the artificial diet and cotton varieties WD‐151 (glandless) and HG‐BR‐8 (glanded). Gossypol at 0.1% concentration in artificial diet did not remarkably increase the body weight of adult wasp, but significantly extended the egg‐larval time and shortened the pupal time; 0. 5% gossypol and HG‐BR‐8 remarkably reduced the body weight of adult wasp, also significantly prolonged the egg‐larval period and decreased the pupal period. Finally, the coordinate application of high gossypol resistant cotton varieties and C. chlorideae in H. armigera control is discussed.
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