Abstract:

Abstract: We systematic investigated of the summer maize pests in the North of Anhui Province. The results of mathematical analys were show that Rhopalosiphum maidis、Colaphellus spp.and Tetranychus cinnabarinus were the most important pests,and the most important predators were Erigonidium graminicolum、Harmonia axyridis、Theridion octomacutatum、Chrysoperla sinica、Propylea japonica、Orius similis、Paederus fuscipes、Nabis sinoferus.By the grey correlative degree analysis we found that R.maidis and C.sinica had the highest correlation,and the same as T.cinnabarinus and N.sinoferus,C.spp and E.graminicolum. The temporal niche breadth value of C.spp.was maximum and the minimum was C.sinica, and the temporal niche values of them were 2.4856 and 2.1081.The temporal niche overlap value of C.sinica between dominant predatory enemies and R.maidis was maximum, that showed the synchronization of their were high. The temporal niche similarity ratio of C.sinica and R.maidis was the largest,the number was 0.9929,so they had a similar time of occurrence. The results showed that predators can be stable and sustained control of the three main pests in corn fields in the North of Anhui Province.