【摘要】 对大棚烟粉虱成虫动态进行了研究。结果表明:烟粉虱成虫的聚集强度随密度的上升而下降;成虫始终处于聚集-扩散-再聚集-再扩散的动态过程之中。烟粉虱成虫在黄瓜植株上部充分展开的幼嫩叶片上数量最大;烟粉虱在大棚黄瓜上呈指数增长,其模型为Nt=2.564 2 e 0.5232t,(r=0.985 8**)。应用最优分割法将烟粉虱成虫动态划分为3个时期,分别为建立期、发展期和暴发期,在种群建立期对烟粉虱实施控制可以获得最佳的效果。更多还原

【Abstract】 Aggregation intensity of Bemisia tabaci adults declined with the increase of their density and B.tabaci adults were always in the dynamic process of aggregation-dispersion-aggregation-dispersion.On the upper,tender and fully opened leaves of cucumber plant,the number of adults was the biggest.B.tabaci number increased following exponential model of Nt=2.564 2 e 0.523 2 t.Adults dynamics was divided into three periods by using the best division method,which were establishment period,development period and outbreak period.Best results could be obtained by controlling the B.tabaci number in establishment period.更多还原