【摘要】 采用田间系统观察和室内饲养方法 ,调查并发现宁夏引黄灌区和新垦区二斑叶螨 (TetranychusurticaeKoch)的寄主植物 88种 ,其中野生寄主植物 5 9种 ,栽培寄主 2 9种 .垦前荒漠、半荒漠有适宜二斑叶螨生存和繁殖的寄主植物分布 .用生命表方法研究了 2 0种主要寄主植物对二斑叶螨实验种群净生殖率 (R0 )的营养效应 ,不同寄主植物随季节的变化其营养效应明显不同 .对二斑叶螨在这些寄主植物间的季节转移规律研究表明 ,宁夏农田 ,以野荠菜Capsellabursa-pastoris、小旋花Calystegiahederacea、小蓟Cephalanoplossegetumji、苦苣菜Sonchusbrachyotus、车前草Plantagoasiati ca、蚕豆Viciafaba、大豆Glycinemax、玉米Zeamays等一起 ,构成了有利于二斑叶螨季节转移的寄主体系 .分析认为 ,宁夏麦套玉米间作大豆的耕种模式是二斑叶螨大发生的主要原因之一 .图 4表 2参 7更多还原

【Abstract】 Systematic surveys in field and laboratory were carried out to explore the dispersion pattern of two spotted spider mite, Tetranychus urticae Koch, and its selection of host plants in the irrigation region and the new reclamation region in Ningxia. The results showed that there are 88 species of host plants, including 59 species of wild plants and 29 species of cultivated plants. The plants good for the spider mite were found in the desert and semi desert areas of pro reclamation. Nutritive function of 20 plant species to net productive rate ( R 0 ) of the spider mite was studied using the methods of life table. The result showed that the nutritive value of different host plants varies with different seasons. The dispersion pattern of two spotted spider mite among its host plants showed that some main wild weeds in farm land, such as, Capsella bursa pastoris, Calystegia hederacea , Cephalanoplos segetumji, Sonchus brachyotus and Plantago asiatica , and several cultivated crops, such as, Vicia faba , Glycine max and Zea mays , made up a host plant system, which was suitable for seasonal dispersion of the spider mite. Analysis indicates that one of the important reasons for the occurrence of the spider mite is the cultivation mode, that is, interplantimg maize with wheat or maize with soybeans. Fig 4 , Tab 2, Ref 7更多还原