The Research Of Insect Pests, Natural Enemies And Insects And Spiders’ Total Community In Different Tea Gardens

There are mainly3kinds of tea gardens at present:general tea garden, nonpolluted tea garden and organic tea garden. Nonpolluted tea gardens and organic tea gardens are the current development trend. This study aims to through the research of the total community of spiders and insects, so that we can contrast and evaluate the ecological effect of different kinds of tea gardens, provide references to the constraction of nonpolluted tea gardens and orangic tea gardens, the research is located in Mingshan County, Sichuan Province. This study through the surveys of nonpolluted tea garden, general tea garden and organic tea garden’s total community, getted the species and numbers of spiders and insects in tea gardens, based on these, analysised the species and numbers of insect pests and natural enemies, used methods of community diversity analysis, community stability analysis, pest’s PCA, ordination of community by PCA and community systemic clustering analysis, and reached the following results:1Investigated164species of spiders and insects in tea gardens. Including pests of8orders,46families,76species, natural enemies of11orders,36families,70species, neutral insects of3orders,14families,18species.2There are30species of suckingpests and46species of chewingpests. The individual numbers of suckingpests is far larger than chewingpests. The families and species of insect pests:organic tea garden> nonpolluted tea garden> general tea garden. The individual numbers of insect pests:organic tea garden<nonpolluted tea garden<general tea garden. The individual numbers and its percent of mites are the biggest in3kinds of tea gardens, secondly, scale insects, leafhoppers, aleyrodids, Scirtotuthrips dorsalis, Toxoptera aurantii etc. Through the research of mites, Empoasca vitis, Toxoptera aurantii and Aleurocanthus spiniferus, analysised their individual numbers with dynamic curve, the dynamic curve of organic tea garden accord with natural laws mostly, which in general tea garden is the worst, and which in nonpolluted tea garden between both.3There are53species of predative natural enemies and17species of parasitic natural enemies, the individual numbers of predative natural enemies is far larger than parasitic natural enemies. The orders, families, species and individual numbers of natural enemies: organic tea garden> nonpolluted tea gaeden> general tea garden. The families and species of Araneae are the most. The individual numbers of Coleoptera, Diptera and Hymenoptera in general tea garden is far lower than the other two kinds of tea gardens, and the biggest in organic tea garden. Through the research of spiders, ladybugs, hoverflies and parasitic wasps, analysised their individual numbers with dynamic curve, it shows that the interference in organic tea garden is the lightest, obviously better than other two kinds of tea gardens, the interference in general tea garden is the strongest.4The contrast of spiders and insects’species and families in total community:organic tea garden>nonpolluted tea garden>general tea garden. The contrast of individual number: organic tea garden<nonpolluted tea garden<general tea garden. The contrast of diversity index:organic tea garden>nonpolluted tea garden>general tea garden; The contrast of homogeneous degree index:organic tea garden>nonpolluted tea garden>general tea garden. The contrast of dominance:organic tea garden<nonpolluted tea garden<general tea garden. The contrast of stability index:Ss/sj:organic tea garden>nonpolluted tea garden>general tea garden, sn/sp: nonpolluted tea garden> general tea garden> organic tea garden. ds/dm: nonpolluted tea garden>general tea garden>organic tea garden.5Pests’ PCA indicate that:The main pests in nonpolluted tea garden are these: Empoasca vitis, Aleurocanthus spiniferus, Acaphylla theae, Calacarus carinatus, Ectropis obligue, Pinnaspis theae, Stephanitis chinensis, Toxoptera aurantii,Ceroplastes japonicas,etc. The main pests in general tea garden are these:Acaphylla theae, Empoasca vitis, Empoasca flavescens, Aleurocanthus spiniferus, Ceroplastes japonicas, Toxoptera aurantii, Calacarus carinatus, etc. The main pests in organic tea garden are these: Empoasca viti, Polyphagotarsonemus latu, Toxoptera aurantii, Scopula subpunctaria, Nephotettix cincticeps, Euproctis pseudoconspersa, Geisha distinctissima, Ceroplastes rubens, Andraca bipunctata, Ceroplastes ceriferus, Stephanitis chinensis, Ectropis obligue, Dialeurodes citri, Scirtothrips dorsalis, Ceroplastesjaponicas, Icerya sp.etc.6By PCA and systemic clustering analysis to total community show that:Organic tea garden’s total community evolution most with the law of nature, nonpolluted tea garden secondly, general tea garden’s community evolution regularity is the worst, its interference is the most strongly.