扶桑绵粉蚧雌成虫在大花马齿苋上的空间格局
Spatial distribution of female adults of Phenacoccus solenopsisTinsley (Hemiptera: Pseudococcidae) on Portulaca grandiflora
黄俊1 沈福泉1 李明江1 郁永明1 吕要斌2＊＊
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作者单位：1. 浙江省农业科学院花卉研究开发中心杭州311202;2浙江省农业科学院植物保护与微生物研究所杭州310021
中文关键词：扶桑绵粉蚧，空间分布，大花马齿苋
英文关键词：Phenacoccus solenopsis，spatial distribution，Portulaca grandiflora
中文摘要：本文对外来入侵害虫扶桑绵粉蚧Phenacoccus solenopsis Tinsley 雌成虫在大花马齿苋(Portulaca grandifloraHook)上的空间分布特征进行了研究。结果表明，在水平上的空间分布表现为聚集分布，个体间相互吸引，分布的基本成分为个体群;雌成虫密度m 和平均拥挤度m* 间的回归方程为:m* = 12. 4595 + 1. 2649 m;雌成虫在大花马齿苋枝条上、中层虫口数量均显著多于下层。确定了不同虫口密度及不同允许误差下的最适抽样数。
英文摘要：The spatial distribution of the female adults of Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) onPortulaca grandiflora Hook was studied． The results show that the spatial distribution of P． solenopsis was highlyaggregative with reciprocal attraction among individuals． The basic component of distribution was the individual group; thelinear regression line had an equation of the form m* = 12. 4595 + 1. 2649 m，where m* is the mean crowding and m isthe density of female adults． Furthermore，the number of P． solenopsis on the upper or middle part of plants wassignificantly greater than on the lower part． Lastly，the theoretical sampling numbers of female adults of P． solenopsis weredetermined under different population densities allowing for sampling error．