大喇叭口期玉米田二斑叶螨成螨空间分布型及其抽样技术

Spatial Distribution Pattern of Adult Tetranychus urticae in Corn Field at Big Trumpet Stage

采用空间分布型检验、聚集强度指标检验和线性回归等方法对甘肃河西地区大喇叭口期玉米害螨的空间分布型开展了研究。结果表明,武威市凉州区大喇叭口期玉米田二斑叶螨成螨空间分布型呈聚集分布,栽培环境或害螨自身习性都可能是影响其聚集分布的因素。并根据Iwao回归和Iwao理论抽样模型,得出其最适抽样模型为N=3.8416/D^(2)(1.9915/m+0.0214),序贯抽样模型为T(1、2)=20 n±13.6343√n,为明确害螨在玉米大喇叭口期的发生危害程度提供了科学依据,对准确田间取样调查数据、虫情预测预报和科学防治具有一定指导意义。

The spatial distribution pattern and sampling technology of Tetranychus urticae in corn fields in Wuwei of Gansu Province were studied by random survey,spatial distribution pattern test and linear regression.The results showed that the spatial distribution pattern of the adults of Tetranychus erioides in the corn field of Liangzhou District of Wuwei City was aggregation distribution,and the cultivation environment or the habitats of the mites might be the factors affecting the aggregation distribution.According to Iwao regression and Iwao theoretical sampling model,the optimal sampling number model was N=3.8416/D^(2)(1.9915/m+0.0214),and its sequential sampling model was T(1、2)=20 n±13.6343√n,which provided a basic scientific basis for clarifying the occurrence and the damage degree of mites at the big trumpet stage of corn,and provided a scientific guiding significance for the accurate field sampling data,pest prediction and scientific control.