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黔东思南县为贵州省的主要棉区,位于乌江下游,海拔420.6公尺,年平均温度17.9℃。年降水量1,275毫米、全年无霜期300天以上。棉花蕾钤盛期的7—8月间平均温度29.2℃,相对湿度70％。这一时期棉叶跳蝉百叶虫口密度可高达200头以上,缩叶病率80％以上,引起的蕾钤脱落率60％左右。近年推广岱字棉15号以后,叶跳蝉的为害较为突出,成为生产中的严重问题。 一、种类 4—9月在塘头区思南棉作试验站一带调查,有棉叶跳蝉Empoasca biguttula Shiraki;棉青叶跳蝉Empoasca
Siandong County in Guizhou Province is the main cotton area in Guizhou Province. It is located in the lower reaches of the Wujiang River at an elevation of 420.6 meters with an annual average temperature of 17.9 ℃. Annual rainfall of 1,275 mm, the annual frost-free period of 300 days or more. The average temperature of cotton buds during July-August is 29.2 ℃ and the relative humidity is 70%. During this period cotton leafhopper parasite density can be as high as 200 or more, more than 80% reduction in leaf disease, caused by lacewing 60% loss rate. In recent years, the promotion of Dai word cotton on the 15th, the leafhopper damage more prominent, a serious problem in production. First, the type 4-September in Sinan cotton in Tangtou area as a pilot station survey, cotton leaf hopper Empoasca biguttula Shiraki; cotton leafhopper Empoasca