The resistant levels of 29 populations of barnyardgrass(Echinochloa crus-galli) in Hunan province and in the other provinces to quinclorac were determined with agar method.

• 本研究采用琼脂法对湖南省、广东省和湖北省等地区29个稗草生物型对二氯喹啉酸的抗性水平进行了测定。