上海地区稻田无芒稗对丁草胺抗药性的测定

Identification of Echinochloa crus- galli var. mitis Resistant to Butachlor from Paddy Fields in Shanghai

为了明确上海地区稻田无芒稗对丁草胺的抗药性水平,采用室内萌发试验测定丁草胺对不同采集地点稗草的抗性指数。结果表明,丁草胺对上海地区稻田无芒稗的EC50值在0.10~0.65μg/m L之间,抗性指数在1.47~9.49之间,其中抗性指数3~5之间样本数占总体样本的66.67%,抗性指数相对较高的地区主要集中在上海东部、西部和南部各郊区。

Laboratory experiments were conducted to determine resistance levels to butachlor among biotypes of Echinochloa crus- galli var. mitis collected in paddy areas of Shanghai. The half effective concentration EC50 value for butachlor among the biotypes ranged between 0. 10 and 0. 65 μg / m L; the resistance indexes were between 1. 5 and 9. 5,among which 64% had resistance indexes between 3 and 5. The sampling sites where relatively higher levels of resistance were found chiefly distributed in the east,west,and south suburban districts of Shanghai.