李平



摘要: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=3.841 6/D2(1.991 5/m+0.021 4),序贯抽样模型为T(1、 2)=20 n±13.634 3,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。
关键词:二斑叶螨;玉米田;大喇叭口期;空间分布型;最适抽样模型
中图分类号:S435.132 文献标志码:A 文章编号:1001-1463(2021)11-0014-05
doi:10.3969/j.issn.1001-1463.2021.11.004
Spatial Distribution Pattern of Adult Tetranychus urticae in
Corn Field at Big Trumpet Stage
LI Ping
(Wuwei Agriculture and Technology Extension Center, Wuwei Gansu 733000, China)
Abstract: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=3.841 6/D2(1.991 5/m+0.021 4), and its sequential sampling model was T(1、 2)=20 n±13.634 3, 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.
Key words:Tetranychus urticae;Corn field;Big trumpet stage;Spatial distribution type;Theoretical sampling model
甘肅河西地区是全国玉米生产基地之 一[1 - 5 ]。近年来,由于频繁引种和栽培模式改变,害螨逐渐上升成为甘肃河西地区玉米产业的主要有害生物之一,其中二斑叶螨是玉米害螨重要种群之一。二斑叶螨(Tetranychus urticae)为蛛形纲蜱螨目叶螨科叶螨属,是叶螨科食性最广的物种,也是重要的世界性害螨。该螨以幼螨、若螨和成螨刺吸植物叶片为害,最初仅分布在植株的下部叶片,随着温湿度的有利变化种群数量不断增加,逐渐向上部叶片活动为害,造成叶片失绿发黄或死亡,严重影响植物的光合作用,抑制植株生长,降低了作物的产量和品质。同时,二斑叶螨环境适应力强,繁殖速度快,具有一定的迁徙和自我保护能力,极易产生抗药性,是公认的最难防治的有害生物之 一[6 ]。……