稻棉轮作对棉红蜘蛛控制作用的研究

稻棉轮作棉田因轮种水稻使红蜘蛛越冬的土壤和寄主杂草环境受到严重破坏，减少了红蜘蛛的越冬基数及早春活动繁殖场所，推迟了进入棉田为害的时间，并促进棉田中天敌数量的增加。从而有效地控制了轮作棉田红蜘蛛的发生危害，减少了防治棉田红蜘蛛的用药次数。

Functions of Field Rotation of Cotton and Paddy Rice in Controling Tetranychus Cinnabarinus (Boisduval).

Because of rotation between paddy rice and cotton field,the habitats of hibernating Tetrany-chus cinnabarinus and their host weed were worsened. The initial number of the overwinting mites was re-duced and their habitats at early spring were worsened. The time of Tetranychus cinnabarinus damage to cotton was postponed, and the numbers of natural enemies in the rotation fields were increased. It was ef-fective to control Tetranychus cinnabarinus and to reduce the applications of pesticides by the rotation.