An Investigation Of Predatory Mites In Gansuprovince And Ontogenetic Study On Euseius Utilis Liang Et Ke

Through the systematic investigation on the predatory mites in Gansu province，The main results are as follows：1.Survey results of predatory mites：Through the systematic investigation on thepredatory mites in gansu province，identification27species Phytoseiidae，belongingto13genus，which include one new specie；first describe the male mite of P. soleigerand Phytoseius huaxiensis；14new record species in gansu province，those areNeoseiulus astutus(Begljarov)， Typhlodromips theae(Wu)， Typhlodromipsheterochaetus(Liang et Ke)，Scapulaseius oguroi(Ehara)，Anthoseius serrulatus（Ehara），Anthoseius concavus(Wang et Xu)，Euseius utilis Liang et Ke，Amblyseiuswuyiensis Wu et Li，Amblytoseius eharai Amitai&Swirski,Anthoseius ailanthiWang et Xu，Amblyseiulella xizangensis(Wu&Lan)，Neoseius rademacheri(Dosse)，Phytosrius huaxiensis Xin，Liang et Ke,Phytosrius hongkongensis Swirski etShechter；E. utilis is most widely distributed and advantage population in gansuprovince.Anthoseius serrulatus is advantage population in the apple orchard oftianshui area，P. soleiger is advantage population of ulmus rubra and prunus trilobaLindl.Find other predatory mites at the same time of investigating the phytoseiidae，ncluding8ncluding which belonged to6genus， those are，Stigmaeidae,laelapidae,Rhodacaroidea,Macrochelidae,Ascidae,Cheyletidae，havingmore ascidae mites in Longnan area。2.For the study on the Individual morphology development of the Euseiusutilis，all of the morphogram of Euseius utilis in everyone state were drawn and theirimportant morphological features were described. During the development processof Euseius utilis，the ossification and color was deeper gradually，somatotype wasgradually become larger from larva to imago. Larva have two piece of dorsal shield，Peritreme and peritremal shield invisible，ossification very weak，Identificationfeatures not obvious．Usually have three pairs of leg. In Sternal shield Place havethree pairs of seta. Protonymph with one piece of dorsal shield，Peritreme andperitremal short. With four pairs of leg，with a pair of pores associated with setae JV2. Deutonymph have five~six pairs of hole，hole in z5below is have or lack of， setanumber increased of segmental venter. Adult female mite with genital shield，Ventrianal shield，Sternal shield，the seta of adult female mite is less thandeutonymph，The posterior margin of the sternal shield is usually ossification weakor indistinction. Usually dorsal shield smooth，with lateral striations，rarely lightlyreticulate. Male Chelicera small，sperma-tophoral process“L-”.