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《Acta Agrestia Sinica》 2007-06
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Study on the Population Dynamics of Main Arthropod Groups in Alfalfa Fields

ZHANG Xin-rui1,LIU Chang-zhong1*,YAN Lin2,CHEN Ying-wu1,WEI Lie-xin1,QIAN Xiu-juan1 (1.Department of Entomology,Pratacultural College,Gansu Agricultural University,Lanzhou,Gansu Province 730070,China; 2.Department of Grassland Sciences,Agriculture and Animal Husbandry College,Qinghai University,Xining,Qinghai Province 810003,China)  
The damage caused by arthropod pest is a main factor restricting the production of alfalfa.Studying the population dynamics and interaction between main arthropods pest and their natural predators in alfalfa field is the foundation of IPM.The population dynamics of main arthropod groups in alfalfa field were investigated in DingXi,Gansu Province.The results show that the main insect pests were Therioaphis trifolii Monell,Acyrthosiphon pisum Harris,thrips,and plant bugs,etc.The major arthropod natural predators were coccinellids,green lacewings,syrphid flies,parasitic wasps,Orius minutus L.,and spiders etc.The population fluctuation pattern of T.trifolii, A.pisum,and thrips was of one peak in the last ten days in June,the first ten days in July,and the first ten days in July,respectively,and the fluctuation models were established.The interactions between aphid and coccinellids,green lacewings,syrphid flies,parasitic wasps,spiders,between thrips and O.minutu,and between plant bugs and spiders were analysed;significant interactions between the populations of main arthropod natural predators and insect pests were detected.The occurrence of natural predators manifested an obvious 'time follow' phenomena which was 10-20 days later than that of pest.
【Fund】: 教育部科学技术研究重点项目(Z06149);; 甘肃省教育厅科学基金(032-04);; 甘肃省创新人才工程科研资助项目
【CateGory Index】: S435.4
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