Weeds present a serious problem in rice paddy fields and severely affect rice (Oryza sativa L.) quality and yield. Quintrione is a new herbicide developed for use in rice. It inhibits p-hydroxyphenylpyruvate dioxygenase and regulates hormone levels to control weeds. In 2014–2016, field plot trials were conducted to evaluate the control efficacies of quintrione at different application rates and times against barnyardgrass, Echinochloa crus-galli (L.) P.Beauv., climbing seedbox, Ludwigia prostrata Roxb., and sheathed monochoria, Monochoria vagi...
