[Quantitative analysis of insect pest and natural enemy communities in Red Fuji apple orchard]

The insect pest and natural enemy communities in Red Fuji apple orchard in Mouping District of Yantai City were quantitatively analyzed by multivariate analysis. The temporal structure of the communities was grouped into five continuous stages by using optimal sorting method, and the community characteristics at each stage were described. The dominant pests and natural enemies were determined at different growth stages of apple trees through analyzing the sub-communities of the insect pests and the predatory and parasitic enemies by principal component analysis and factor analysis. Canonical correlation analysis showed that there were significant correlations between the dominant insect pests and the dominant natural enemies, especially between Lithocolletis ringoniella and its parasitoids, between Aphis citricola and its parasitoids, and between Tetranychus viennensis and its obligatory predatory enemies, Stethorus punctillum and Amblyseius orientalis.