Distribution, frequency and molecular basis of penoxsulam, metamifop and florpyrauxifen-benzyl resistance in Echinocloa spp. from rice fields across Jiangsu Province, China.

Barnyard grasses (Echinochloa spp.) are the most troublesome weeds in rice ecosystems of Jiangsu Province, China, and long-term use of herbicides inevitably cause the development of resistance. In this study, 122 field-sampled populations were tested for resistance to penoxsulam (PEN), metamifop (MET), florpyrauxifen-benzyl, (FPB), propanil, and tripyrasulfone.