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本试验研究了棉花不同生育期棉红叶螨(Tetranychus urticae Koch)的数量,叶片受害指数(叶受害面积大小)与产量损失的关系、棉花自身的补偿能力,以及影响种群的因素,较客观地反映害螨为害与损失的相关关系,以便制定适当的防治指标。 试验方法 选棉花长势基本一致,红叶螨从苗期开始为害较重的玉米棉花间作棉田一块,品种为岱字棉,前茬纯作蚕豆,划分几个处处理区,每处理区面积0.065亩,棉花出苗后分区分期防治。其它病虫一律不防治,田间栽培尽量求其一致。
The objective of this study was to investigate the relationship between the number of Tetranychus urticae Koch, the damage index of leaf (the area affected by leaf damage) and the yield loss, the compensation ability of cotton itself and the factors affecting the population at different growth stages. Pest damage and loss of the relationship between the relationship in order to develop appropriate control indicators. Test methods selected cotton growing basically the same, mite mites from the seedling stage of heavier corn cotton intercropping a piece of cotton, the variety is Dai word cotton, pure cotton as the former crop beans, divided into several treatment areas, each treatment area of 0.065 acres, Cotton seedling stage after the prevention and control. Other pests and diseases are not preventable, field cultivation try their best.