烟田南美斑潜蝇空间分布型研究

Study on Spatial Pattern of Liriomyza huidobrensis Blanchard in Tobacco Field

用聚集度指标法 ,对南美斑潜蝇在烟田的空间分布状况进行了调查和分析。结果表明 ,该幼虫在烟草苗床和大田中均属聚集性分布 ,分布的基本成分为个体群 ;在烟株上的垂直分布叶位随虫口密度的增大及烟株生育期的变化而增高 ,但在烟草各生育期及不同虫口密度下 ,均主要分布在烟株下部 1～ 3位叶 ,对中、上部叶一般无危害 ;同时 ,分析拟合了南美斑潜蝇在烟草苗床和大田中的理论抽样数模型分别为 :N1=0 .7885 (t/ D) 2· x-1.3 0 92 和 N2 =2 .2 793(t/ D) 2· x-0 .8442。

The spatial pattern of Liriomyza huidobrensis Blanchard in tobacco field was studied with the indices of patchiness. The results showed that the spatial patterns of the larvas of the pest in tobacco bed and field were aggregative, and the distribution unit of the pest was an aggregated colony. The harmful leaf site of the plants rised with the populations of L. huidobrensis increasing and the plants developing, 1~3 leaves of the lower part of the plants were the most serious. Meantime, the models of theoretical sampling for L. huidobrensis in tobacco bed and field were set up, that were N 1=0.7885(t/D) 2· -1.3092 and N 2= 2.2793 (t/D) 2· -0.8442 ?