Studies On Arthropod Communities Of Guava Orchards In South Fujian Province

The composition and diversity of arthropod communities in guava orchards were investigated and the effects of interplanting on arthropod communities in guava orchards were studied in Huian country, Fujian Province, China from August 2006 to August 2007. The results are as follows:In total, 218 arthropod species belonging to 16 orders, 100 families of Insecta and Arachnoidea were collected from tree crown. Among them, 116 species were pests, 61 species were natural enemies and 41 species were neutral insects. The dominant pests were Bactrocera dorsalis (Hendel) and Aphis gossypii Glover, and the dominant natural enemies were Oxyopes macilentas L. Koch and Chrysopa septempunctata Wesmael. The arthopods under tree crown included 168 species belonging 24 orders, 91 families of Insecta and Arachnoidea, which were composed of 101 species of phytophagous insects, 22 species of predatory and parasitic insects, 15 species of scavenger insects and 30 species of spiders. The dominant phytophagous insects were Acrida cinerca Thunberg and Recilia dorsalis (Motschlsky), the dominant spider was Oxyopes macilentas L. Koch, and the dominant parasitic insect was Bracon chinensis Szepligeti.The arthropod components between two types of guava orchard, the interplant orchard and the non-interplant orchard, were also observed. The arthopods of tree crown in the interplant orchard included 92 species belonging to 65 families of 15 orders in Insecta and Arachnoidea, 93 species belonging to 64 families of 13 orders in Insecta and Arachnoidea in the non-interplant orchard. Both the individual quantity index and the evenness index of pests in the interplant orchard were more than that in the non-interplant orchard, but other indices were no significant differences between two orchards. The arthropods under tree crown in the interplant orchard included 108 species belonging to 61 families of 13 orders in Insecta and Arachnoidea, and 133 species belonging to 66 families of 15 orders in Insecta and Arachnoidea in the non-interplant orchard. There were no significant differences on the characteristic indices of phytophagous insects, predatory and parasitic insects, scavenger insects and spiders between two orchards.