氯虫·噻虫嗪撒施对水稻害虫的田间防治效果

2013~2014年,采用田间小区试验评价了1.5%氯虫·噻虫嗪GR、0.4%氯虫苯甲酰胺GR和25%噻虫嗪WG撒施处理对水稻二化螟、稻纵卷叶螟和稻飞虱的防治效果。结果表明:水稻移栽后5~10 d,1.5%氯虫·噻虫嗪GR 90.0~112.5 g/hm~2撒施1次,可有效控制水稻二化螟、稻纵卷叶螟和稻飞虱危害;0.4%氯虫苯甲酰胺GR 42.0 g/hm~2撒施1次,对二化螟及稻纵卷叶螟防效较高,但对稻飞虱防效较差;25%噻虫嗪WG 37.5 g/hm~2撒施1次,对稻飞虱防效较高,但对二化螟和稻纵卷叶螟基本无效。因此,建议在水稻生产实践中,于移栽后5~10 d撒施1次1.5%氯虫·噻虫嗪GR 90.0~112.5 g/hm~2,防治水稻生长前期的二化螟、稻纵卷叶螟及稻飞虱;间隔40 d再补施1次,以有效控制水稻生长后期的上述害虫危害。

Control Efficacies of Chlorantraniliprole·Thiamethoxam by Broadcast against Rice Pests under Field Conditions

In this study, field plot experiments were conducted to evaluate control efficacies of 1.5% chlorantraniliprole·thiamethoxam GR, 0.4% chlorantraniliprole GR and 25% thiamethoxam WG by broadcast application against the striped stem borerChilo suppressalis, rice leaf-rollerCnaphalocrocis medinalis and rice planthoppers in 2013?2014. The results showed that the above rice pests could be obviously controlled by 1.5% chlorantraniliprole·thiamethoxam WG applied at rate of 90.0~112.5 g/hm2, which was broadcasted within 5~10 d after rice transplanting. However,C. suppressalisandC. medinalis were effectively controlled by 0.4% chlorantraniliprole GR applied at a rate of 42.0 g/hm2, but rice planthoppers could not be. Rice planthoppers were obviously controlled by 25% thiamethoxam WG applied at a rate of 37.5 g/hm2, butC. suppressalis andC. medinalis could not be. The study suggested that, during the process of rice production, 1.5% chlorantraniliprole·thiamethoxam GR could be broadcasted at rate of 90.0~112.5 g/hm2 within 5~10 d after rice transplanting to control C. suppressalis,C. medinalis and rice planthoppers in the early growth stage of rice , and then could be applied again 40 d after the first broadcast to control the above rice pests effectively in the late growth stage of rice.