摘要
目的:筛选出防除碎米知风草的高效除草剂,为田间防治碎米知风草提供选药依据.方法:通过整株生物测定法,明确水稻田20种除草剂对碎米知风草的生物活性,并选取其中7种高活性药剂进行田间防效评价.结果:土壤处理药剂丁草胺、丙草胺、莎稗磷、乙氧氟草醚、噁草酮、环戊噁草酮、二甲戊灵、仲丁灵、硝磺草酮、扑草净和茎叶处理药剂吡唑喹草酯、苯丙草酮、噁唑酰草胺、敌稗、禾草丹对碎米知风草的活性较高,G R90分别为140.47、41.39、92.08、2.92、153.91、34.03、16.76、65.97、7.37、130.30、144.93、68.70、80.46、2520.32、1918.3ga.i./hm2,均低于各自的田间推荐剂量.结果 表明,药后45d,土壤处理药剂二甲戊灵、丙草胺、仲丁灵及茎叶处理药剂敌稗、苯丙草酮在推荐剂量下对其防效最高,鲜质量防效为82.95％ ～92.32％.结论:该5种药剂在推荐剂量时对碎米知风草均有较高防效,在田间防除此种杂草时应结合当地用药现状优先选用.
Abstract
Objective:The high-efficiency herbicides for controlling Eragrostis japonica were screened out ,which provided the basis for selecting herbicides for controlling E.japonica in the field.Methods:Through the whole plant bioassay method ,the biological activity of 20 herbicides in paddy field on E.japonica was determined ,and 7 highly active herbicides were selected for field evaluation.Results:The pre-emergence herbicides butachlor , pretilachlor , anilofos , oxyfluorfen , oxadiazon , pentoxazone , pendimethalin , butralin , mesotrione , prometryn and the post-emergence herbicides pyraquinate , feproxydim ,metamifop ,propanil ,thiobencarb had higher activity on E.japonica.GR90 were 140.47 , 41.39 ,92.08 ,2.92 ,153.91 ,34.03 ,16.76 ,65.97 ,7.37 ,130.30 ,144.93 ,68.70 ,80.46 ,2520.32 , 1918.3 g a.i./hm2 ,respectively ,which were lower than the recommended dose in the field.The field results showed that 45 days after treatment ,the pre-emergence herbicides pendimethalin ,pretilachlor , butralin and the post-emergence herbicides propanil and feproxydim had the highest control effect at the recommended dose ,and the fresh weight control effect was between 82.95％ and 92.32％.Conclusion:The five agents had good control effect on E.japonica at the recommended dose.When controlling this weed in the field ,they should be preferentially selected in combination with the current situation of local herbicide use.
基金项目
安徽省科技重大专项(202203a06020016)
维普
万方数据