麦黑斑潜叶蝇幼虫空间分布及抽样技术研究

Study on the Spatial Distribution Pattern of the Larvae of Cerodonta denticornis and Its Sampling Technique

研究结果表明 :麦黑斑潜叶蝇幼虫在小麦田属于聚集分布 ,分布的基本成分是个体群 ,聚集度随着种群密度升高而增大 ;幼虫在不同虫口密度下最适抽样公式为 :N =t2 ( 2 .90 3 3 /m +0 .3 2 73 ) /D2 ;有虫株率与平均虫口密度关系式为 :m =-0 .0 62 6+0 .0 3 67p(r=0 .992 4 )。

Cerodonta denticornis is a pest that damages leaf of wheat. The experimental results showed that the spatial distribution pattern of the larvae of Cerodonta denticornis was aggregation from April to May in 2003.The basic components of the spatial pattern were colonies. Theoretical sampling number in the field for the survey of larvae of Cerodonta denticornis was presented. The relationship between average population density and the ratio of Harmec plants could be expressed by the mathematic model:m=-0.062 6+0.0367 p (r=0.992?4 **)