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草业学报  2014 

抗二氯喹啉酸稗草对6种除草剂的多抗性分析及田间控制效果评价

DOI: 10.11686/cyxb20140631, PP. 259-265

Keywords: 抗药性稗草,二氯喹啉酸,6种除草剂,多抗性,田间药效

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Abstract:

稗草是稻田恶性杂草,二氯喹啉酸(quinclorac)是防治稗草的特效药,但长期使用出现了抗药性。为有效控制田间抗二氯喹啉酸的稗草,用室内盆栽法分析了五氟磺草胺、双草醚、嘧啶肟草醚、氟吡磺隆、噁唑酰草胺和氰氟草酯6种除草剂对抗性稗草的多抗性,并通过大田试验评价了上述6种除草剂对抗性稗草的防效。结果显示,五氟磺草胺等6种除草剂对不同生物型稗草R1、R2、S均表现出较高的生物活性,抗性稗草R1、R2对五氟磺草胺、双草醚、嘧啶肟草醚、氟吡磺隆、噁唑酰草胺和氰氟草酯6种除草剂抗性指数为1.05~1.28,无多抗性产生。使用6种药剂的田间推荐剂量处理,以2.5%五氟磺草胺OD和10%噁唑酰草胺EC对抗性稗草的防效最好,药后20和40d的防效均在95%以上。其次是10%双草醚SC,药后20和40d的防效均在90%以上。再次是5%嘧啶肟草醚EC,药后20和40d的防效均在85%以上。10%氰氟草酯EC和10%氟吡磺隆WG对抗性稗草的防效最差,处理后20和40d防效均不到85%。这进一步验证了五氟磺草胺、双草醚、嘧啶肟草醚、氟吡磺隆、噁唑酰草胺和氰氟草酯6种除草剂对抗二氯喹啉酸的稗草无多抗性产生。6种除草剂均可在稗草对二氯喹啉酸产生抗药性的稻区使用。但以五氟磺草胺、双草醚和噁唑酰草胺3种除草剂对抗药性稗草的防效最优。

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