5%环虫酰肼悬浮剂对水稻稻纵卷叶螟的田间防效

Field Efficacy of 5% Chromafenozide Suspension Concentrate against Rice Leaf Folder,Cnaphalocrocis medinalis Guenee

[目的]明确5%环虫酰肼悬浮剂对稻纵卷叶螟的防治效果。[方法]于2013、2014年分别在广东广州南沙区、汕头市潮阳区通过田间试验评价了5%环虫酰肼悬浮剂对稻纵卷叶螟的防效。[结果]5%环虫酰肼悬浮剂对稻纵卷叶螟具有较好的杀虫和保叶效果。70.00 g/hm2剂量对稻纵卷叶螟幼虫的防效可达到86.46%~96.43%。南沙区施1次药,53.75~70.00 g/hm2剂量的保叶效果为82.12%~89.25%,37.50 g/hm2剂量的防效低于80%;潮阳区施2次药,37.50~70.00 g/hm2剂量的保叶效果均达到90%以上。[结论]为该药剂的进一步推广应用提供了理论依据。

[Objective]The aim was to understand the control effect of 5% chromafenozide suspension concentrate on Cnaphalocrocis medinalis.[Method]The control effect of 5% chromafenozide suspension concentrate on Cnaphalocrocis medinalis was studied through field trials in nansha district and chaoyang district,guangdong,P. R. China,respectively,from 2013 to 2014. [Result]5% chromafenozide suspension concentrate had better effect on Cnaphalocrocis medinalis. The control efficiency of 5% chromafenozide suspension concentrate was 86. 46%- 96. 43% at the active ingredient dosage of 70. 00 g / hm2 against the larve of Cnaphalocrocis medinalis in field. In nansha district,the leave protecting effects of5% chromafenozide were 82. 12%- 89. 25% at the dosages of 53. 75- 70. 00 g / hm2 for one spraying,which at the dose of 37. 50 g / hm2 was less than 80%. In chaoyang district,the leave protecting effects of 5% chromafenozide were more than 90% at the dosages of 37. 50- 70. 00 g / hm2 for spraying twice. [Conclusion] The results provide theoretical basis for futher popularization and application of 5% chromafenozide suspension concentrate.