Abstract:

For evaluating the effects of transgenic Bt cottonseeds, the population dynamics of main dipteran and mite pests in the cultures containing transgenic Bt cottonseeds and non-transgenic cottonseeds for the mushroom Pleurotus ostreatus planted in the cage were investigated. The results showed that the population of Lycoriolla pleuroti and mites in the culture containing non-transgenic cottonseeds was higher than in the culture containing transgenic cottonseeds. With the increase of both transgenic and non-transgenic cottonseed content in the culture, the occurrence of L. pleuroti decreased. But for Scatopse spp., the effect of non-transgenic cottonseeds was stronger than that of transgenic cottonseeds, and the population of Scatopse spp. showed a clear decreasing tendency with the increase of the non-transgenic cottonseed content. With the increase of cottonseed content, the population of Megaselia spp. increased in the culture containing non-transgenic cottonseeds, but decreased in the culture containing transgenic cottonseeds. The effect of transgenic cottonseeds on Megaselia spp. was stronger than that of the non-transgenic cottonseeds when the content of cottonseed was low,  while this tendency was in contrary when the content of cottonseed was high.

Key words: Transgenic Bt cotton, cottonseed, Pleurotus ostreatus, Lycoriolla pleuroti, Scatopse spp., Megaselia spp., mites, population dynamics