Abstract:

The natural enemy arthropods are applied to control pest insects, which improve the integrated pest management in jujube yard. The spatio-temporal structure and dominance of natural enemy arthropod in jujube yard were systematically studied by a survey method. According to the survey data, there were 1 648 natural enemy arthropod, including 1 331 samples on the ground surface and 317 samples on the trees. The natural enemy arthropods belonged to 2 classes, 10 orders, 52 families and were divided into four subcommunities, that is predacious insects, parasitic insects, predacious spiders and predacious mites. In different month, there was different dominance index of natural enemy arthropods between on the ground surface and on the trees. Then, the correlation of primary and secondary effect of cumulative dominance index was analyzed by the Pareto Charts method. Their status and function of ecological control were compared and estimated to determine when subcommunities of natural enemy arthropod were controlling the pest insects. Predacious arthropods，especially Coccinellidae， had primary effect for controlling pest insects on the ground surface. Both parasitic insects and predacious arthropods，such as Pteromalidae, Ichneumonidae, Chrysopidae, Araneidae, had primary effect on pests on the trees.

Key words: jujube yard, natural enemy arthropod, spatio-temporal structure, dominance, primary and secondary effect