韭菜根蛆空间分布研究及产量损失评价

Spatial Distribution of Bradysia odoriphaga and Loss Rate Estimate of Chinese Chives

利用聚集度指标法和回归模型分析法系统研究了韭菜根蛆种群的空间分布型。结果表明,韭菜根蛆在田间为聚集分布,符合负二项分布型,此聚集与其生物习性有关,或由自身生物习性和环境因素共同作用所致;相关分析表明,韭菜根蛆的虫口密度和产量损失率呈直线正相关,虫口密度越大,产量损失率越高。

The aggregation index and regression analysis methods were used to investigate the spatial distribution pattern of Bradysia odoriphaga.The results showed that B.odoriphaga aggregated in the filelds and its distribution mode obeyed negative binomial model.Biological characteristics or both biological characteristics and environmental factors were related to the aggregation.The population density of B.odoriphaga was positively and linearly correlated with yield loss.The larger the population density was,the higher the yield loss rate would be.