The effect of using genetic diversity of wheat varieties for ecological regulation on Sitobion avenae.

peer reviewedTo study the ecological effect of genetic diversity in wheat field on Sitobion avenae. the population dynamic of S. avenae and it’s natural enemies was investigated systematically in wheat fields， the spatial distribution of S. avenae.was also analyzed.The results showed that, compared with monocultures, cv. Beijing 837, the amount of S. avenae apterae per 100 plants in intercropping pattern were significantly lower during aphid peak period, and the cascade of population densities was that cv. Beijing 837 monoculture(7422.0) > intercropped with cv. KOK(5796.7) > intercropped with cv. Hongmanghong(5406.7) > intercropped with cv. Zhengzhou831(5291.7) > intercropped with cv. JP2(4493.4) > intercropped with cv. Zhongsiwumang(4155.0),,and the spatial distribution of S. avenae were changed from aggregated pattern to uniform one. In aphid parasitoids peak period, there were higher population densities of aphid parasitoids in each intercropping field with the very significant level of P<0.01. The theoretical yield were more increasing with the significant level of P