The Study On Structure Of Arthropod Community In Cotton Fields Of Jilin Province

The arthropod community structures and characteristic index were studied through investigating the arthropod species and population dynamics. And we clearly obtained the species of the primary pest, the occurrence dynamics of dominant predator and the structural features of arthropod community in cotton fields of Jilin province. That provided the reliable basis to integrated pest management, the results are followed:1.We integrated arthropod community that includes 2 classes, 9 orders, 45 families, 64 species, in cotton fields of Jilin province. It made up of insecta and arachnida. and insecta had 8 orders, 41 families, 59 species, which includes 5 orders, 28 families, 40 species, insect pests, 6 orders, 10 families, 15 species, predatory natural enemy 2 orders, 9 families, 9 species, neutral insects in specific and arachnida 1 orders, 4 families, 5 species, in cotton fields of Jilin province. We integrated the species of insect pests 5 orders, 26 families, 39 species, predatory natural enemy 6 orders, 10 families, 15 species, neutral insects 2 orders, 9 families, 9 species, in conventional cotton fields of Jilin province, We integrated the species of insect pests 5 orders, 23 families, 33 species, predatory natural enemy 6 orders, 8 families, 13 species, neutral insects 2 orders, 9 families, 9 species, in transgenic cotton fields.2.The major orders in the cotton fields is Hemiptera, coleopteran, Hymenoptera and Araneae which count respectively 72.11%, 9.56%, 8.93%, 4.25% for the individuals numbers of arthropod animals in the conventitonal cotton fields of Jilin province, the more individual number is Aphididae(62.00%), Formicinae(11.42%), Chrysomelidae(7.56%) and Coccinelliade(4.51%), Thomisidae(4.12%); The cotton arthropod in genetically modified respectively 73.96%, 9.09%, 8.02%, 4.22%, the more individual number is Aphididae(62.25%), Formicinae(11.00%), Chrysomelidae(8.41%) and Thomisidae(4.30%), Coccinelliade(4.25%). There were no obvious differences in the community diversity index, community evenness index, concentration index of community dominance in two kinds of cotton, it shows that there was no significant difference between the stability of two kinds of cotton community.3.The dominant species are Aphis gossypii Glover, Monolepta hieroglyphica(Motschulsky), Cicadella viridis(Linnaeus), Phaneroptera nigroantennata Brunner von Wattenwyl, mirid, Bemisia tabaci(Gennadius) etc. in cotton fields of Jilin province. The Aphis gossypii Glover is appeared in whole period, and it started to outbreak period in July, Monolepta hieroglyphica(Motschulsky) is appeared in July to September, it started to outbreak period in August, Cicadella viridis(Linnaeus) is appeared in July to September, and it started to outbreak period in September, Phaneroptera nigroantennata Brunner von Wattenwyl is appeared in July to September, and it started to outbreak period in September, Mirid is appeared in June to September, it started to outbreak period in August, Bemisia tabaci(Gennadius) is appeared in August to September, it started to outbreak period in August. The predatory natural enemy species is abundant, the dominant species are Harmonia axyridis(Pallas), Propylea japonica(Thunberg), Coccinella seplempunctata Linnaeus, Orius minutus(Linn.), spiders, Chrysopa sinica Tjeder, Episyrphus balteata(De Geer). Harmonia axyridis(Pallas), Propylea japonica(Thunberg), Orius minutus(Linn.), spiders are occurred in June to September, it started to outbreak period in August, Chrysopa sinica Tjeder, Episyrphus balteata(De Geer) is appeared in June to September, it started to outbreak period in August, Coccinella seplempunctata Linnaeus is appeared in June to July, it started to outbreak period in June.