Investigation On Thrips Species In Hohhot And Its Surrounding Areas

The investigation of thrips species is the basic theory for further study of thrips,at present,there is no report on the investigation of thrips in Hohhot,In this study,thrips were randomly collected in the field and permanent slide specimens were made,the morphological identification pictures of thrips were obtained by modern digital microscope,the microscopic identification pictures of thrips were obtained by stereomicroscope,refer to thrips classification books,literatures and web pages,preliminary identification of thrips species in this area,on this basis,the species of thrips in Medicago sativa were investigated,the insecticide sensitivity of the dominant species was analyzed by leaf dipping method.In this study,thrips on different host plants in the surrounding area of Hohhot were identified scientifically and reasonably,the species distribution of thrips in Hohhot was preliminarily determined;the species of thrips harming Medicago sativa were determined by investigation,master the dominant species--sensitivity of Frankliniella intonsa to insecticides,to provide basic scientific basis for the prevention and control of Medicago sativa thrips.The species of thrips in Hohhot area belong to 6 genera and 17 species,they are 2species of Aeolothrips of Aeolothripidae in Terebrantia,1 species of Megalurothrips Bagnall in Thripidae,1 species of Odontothrips,2 species of Frankliniella,10 species of thrips,and 1 species of Haplothrips of Phlaeothripidac Tubulifera;Thrips is the dominant genus and Frankliniella intonsa Trybom is the dominant species;the Palaearctic is the dominant fauna in the world;in the distribution of fauna in China,the17 species of thrips mainly exist in Mengxin and North China;in the distribution of three vegetation belts in Inner Mongolia,thrips are mainly distributed in typical steppe subzone.Through the analysis of thrips species in this area,it is found that,including Thrips flavus Schrank,Thrips flavidulus(Bagnall),Thrips brevicornis Priesner and Thrips palmi Karny are very similar to the invasive pest thrips palmatum in morphological identification.There are 13 external morphological features of the four thrips;The number of antennal nodes,The position of the bristles in the head and the relationship between the size of bristles Ⅱ and Ⅲ in the dorsal segment of abdomen can be distinguished.The thrips in the Medicago sativa planting areas around Hohhot city mainly include Frankliniella intonsa Trybom,Odontothrips loti Haliday and Megalurothrips usitatus Bagnall,Among them,Frankliniella intonsa Trybom is the dominant species,Megalurothrips usitatus Bagnall first appeared in Medicago sativa.Frankliniella intonsa in this area to pyrethroid insecticides,neonicotinoid insecticides,abamectins are sensitive,to phoxim of organophosphate insecticides has been developed.