Studies On The Dynamics Of Arthropod Communities And The Relations Of Main Pests With Their Natural Enemies In Wheat Fields

Wheat is an important marketable and strategy food. Its production affects food security, agriculture efficiency and farmer's benefit. Agricultural synergy and increation of production in wheat producing area. Under pleasant management, The effect that pest was controlled affect on production, quality and beneficial result. IPM of pests lived in wheat field was seriously in whole country.The arthropod community in wheat was investigated in proving ground of Linyi-Wheat-4 in Linyi Academy of Agricultural Sciences. Shandong Province. The traits of arthropod community in wheat, the control of main pests and the interaction of main pests with its natural enemies were studied with the methods of diversity indexes, path analysis, principal component analysis and clustering analysis. The research would provide basic scientific information for IPM with pests and development in wheat production. The results showed:(1) The arthropod total community was divided into phytophage, predacious, parasitic-neutrality sub-community according to species nutrition and predator-prey relationship. Total components and each sub-community were analyzed by number of groups, individual numbers and some ecological indexes. The relative abundance of phytophage was 96.85%. Predacious sub-community was 2.37%. Parasitic and neutrality sub-community was 0.76%.(2) The seasonal dynamics of the total arthropod community and the different sub-community had been detected, which included the species richness, the dominance, the dominant concentration, the pielou evenness and the H'diversity index. The phytophage sub-community had the same trend in terms of the species richness, the dominance, the dominant concentration, the pielou evenness and the H'diversity index with the total arthropod community.(3) The characteristic parameters of arthropod total community and its phytophagous, predacious sub-community in wheat fields were analyzed with the method of principal component analysis. Individual and species numbers had greater contribution to total arthropod community.(4) The relationships between diversity indexes and other ecological indexes in every community were checked with path analysis. The results showed that the species numbers had close relationship with diversity indexes in total community.(5) The characteristic parameters of arthropod total community and its phytophagous, predacious sub-community were analyzed with the methods of clustering analysis and optimization cut. The results indicated that the total arthropod community was divided into 5 clusters when distance was 1.73. The clusters result of the optimization partitions in the total arthropod community was 4. The dominant natural enemy of Adelgoidea was Harmonia axyridis,Chrysopa septempunctata,Sprphidae and Lycosidae.(6) In this present study, the quality, time and spatial framework of Adelgoidea and its natural enemies were employed using stepwise regression analysis, grey system analysis, ecological niche analysis and aggregated-intensity index analysis of spatial patterns.(7) The experimentation of control Adelgoidea by using 20% Imidacloprid to detect the efficiency. It was 90.4% after 1d; Seven days could reach 100% efficiency. The results indicated that the control effect was efficient, quick, and persistence. The 20% Imidacloprid was one of ideal insecticide.