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用“3911”浸、闷棉种是过去防治棉花苗期蚜虫的一项有效措施,经“3911”处理过的棉种防治棉蚜残效期可达40—60天,在麦收前基本可控制棉蚜的为害,个别地块最多再打一次药。然而“3911”经过多年在棉区的不断应用,棉蚜是否对“3911”产生了抗药性或交互抗药性?防治效果和有效控制期是否有了变化?根据我们最近三年来在通县小稿大队的重复试验和大面积观察,这项措施的效果已大大降低,一般年分只能控制25—30天,而且在这期间也只有部分控制作用;在发生
With “3911” soaked, stuffy cotton is the past prevention and treatment of cotton seedling aphids is an effective measure, “3911” treated cotton seed cotton control aphid residual effect of up to 40-60 days before the wheat harvest basic controllable cotton Aphid damage, individual plots up to a second drug. However, after years of continuous application of “3911” in the cotton area, has the cotton aphid become resistant or cross-resistant to “3911”? Has the control effect and the period of effective control changed? According to our recent three years in Tongxian draft Repeated trials and extensive observation by the brigade have greatly reduced the effectiveness of this measure, which can only be controlled for 25-30 days in ordinary years and only partly controlled during this period.