乙基多杀菌素与阿维菌素混用对水稻稻纵卷叶螟及二化螟的田间防治效果

2015~2016年,采用田间小区试验评价了60 g/L乙基多杀菌素SC、2%阿维菌素EC及其混用对稻纵卷叶螟和水稻二化螟的防治效果。结果表明:单一喷施60 g/L乙基多杀菌素SC 9~18 g/hm~2或2%阿维菌素EC 30~60 g/hm~2对稻纵卷叶螟的控制作用较好,却难以控制二化螟危害;药后14 d,对稻纵卷叶螟的防治效果分别为71.01%~82.48%和75.52%~87.35%,而对二化螟的防治效果分别为60.97%~72.62%和62.73%~76.57%;以上2种药剂混用后,可有效控制稻纵卷叶螟和二化螟危害,药后14 d的防治效果分别为79.70%~92.20%和71.03%~87.77%。这表明乙基多杀菌素与阿维菌素混合喷施可有效控制水稻稻纵卷叶螟和二化螟危害。

Control Efficacy of Spinetoram plus Abamectin on Cnaphalocrocis medinalis and Chilo suppressalis under Field Conditions

Field plot experiments were conducted in this study to investigate control efficacies of 60 g/L spinetoram SC, 2% abamectin EC and their mixtures on the rice leaf-rollerCnaphalocrocis medinalis and striped stem borerChilo suppressalis in 2015-2016. The results showed that the foliar spray of 60 g/L spinetoram SC at 9-18 g/hm2 or 2% abamectin EC at 30-60 g/hm2 gave good control against C. medinalis, but poor control againstC. suppressalis. The control efficacies of them againstC. medinalis were 71.01%-82.48% and 75.52%-87.35%, respectively, 14 d after treatment; and control efficacies againstC. suppressalis were 60.97%-72.62% and 62.73%-76.57%, respectively, 14 d after treatment. However,C. medinalis andC. suppressalis were effectively controlled by mixtures of above two insecticides, and the control efficacies against them were 79.70%-92.20% and 71.03%-87.77%, respectively, 14 d after treatment. It was suggested that the foliar spray of spinetoram plus abamectin could be recommended for effective control ofC. medinalis andC. suppressalis in rice.