稻田稗草对丁草胺和二氯喹啉酸抗药性的测定

Identification of Barnyardgrass(Echinochloa crusgalli) Resistant to butachlor and quinclorac in rice fields

[目的]为明确稻田稗草对丁草胺和二氯喹啉酸的抗药性水平,利用盆钵法测定了广东佛冈、韶关、梅州等地共14个点稻田稗草对丁草胺和二氯喹啉酸的抗药性。[结果]对于丁草胺,惠州龙门稗草ED50值最大,为757.33 g a.i./hm2,相对抗性指数(RI)为3.4,说明龙门点稗草对丁草胺已产生一定的抗药性;对于二氯喹啉酸,所测定的14个稗草生态型对其未表现出抗药性。[结论]稻田稗草对丁草胺已经产生不同程度的抗药性,其中惠州龙门点抗性最高;稻田稗草对二氯喹啉酸未产生抗药性。

The objective of this study was to investigate the resistance level of barnyardgrass to butachlor and quinclorac.Fourteen barnyardgrass biotypes were collected from different rice fields at areas in Guangdong province.The resistance level of barnyardgrass to buthachlor and quinclorac was assessed by pot assay method.[Results]The results demonstrated that Longmen biotype has the highest ED50 value（757.33 g a.i./ha） to butachlor and its relative resistance index（RI） was 3.4 which showed that Longmen biotype had developed resistance to butachlor in fields.In terms of quinclorac,no resistance was found in these 14 barnyardgrass biotypes.[Conclusions]Resistance of barnyardgrass in rice fields has occurred to butachlor,and Longmen biotype was the most resistant one.All identified barnyardgrass biotypes have not developed resistance to quinclorac.