棉叶螨在冬春棉田田埂寄主植物上的分布

采用等距取样方法对棉叶螨在长江中游棉区包括江西瑞昌市、湖南澧县、湖北荆州区、湖北江北农场4个棉区15种类型田的冬春棉田田埂寄主植物上的分布进行了调查.结果表明,棉叶螨的寄主植物共有27科64种,婆婆纳(Veronica polita Fries)、乌蔹莓(Cayratia japonica Gagnep)和黄鹌菜(Youngia japonica DC)为棉叶螨的优势寄主；寄主植物上棉叶螨的若成螨、幼螨和卵数量比例为72.1:20.5:7.4,以若成螨数量最多;而前茬作物为小麦且使用除草剂的田块田埂上寄主植物的棉叶螨的数量最少,有螨株率仅为3.33％.由鱼塘或稻田改造棉田均没有明显影响田埂上寄主植物的棉叶螨数量.

Distribution of Cotton Spider Mites on Host Plants on Cotton Field Ridge in Winter and Spring

Distribution of cotton spider mites in winter and spring on host plants on 15 kinds of cotton fields ridge from 4 cotton planting districts in the middle reaches of Yangtze River,including Ruichang of Jiangxi Province,Li County of Hunan Province,Jingzhou District and Jiangbei Farm of Hubei Province,was surveyed by equidistant sampling method.The results showed that there were 64 host plants species belonging to 27 families in cotton fields,among which Veronica polita Fries,Cayratia japonica Gagnep and Youngia japonica DC.were dominant host plants species.The ratio of number of adults and nymphs,larvae and eggs of cotton spider mites on host was 72.1∶20.5∶7.4,and the number of adults and nymphs was larger than the others.Cotton spider mites on host plants in fields where previous crop was wheat and herbicide was applied the least as only 3.33% plants were fed by cotton spider mites.There was no significant effect on the number of cotton spider mites on host plants on the cotton fields ridge in winter and spring by transforming pond or rice fields into cotton fields.