Benzobicyclon for weedy rice control in quizalofop- and imidazolinone-resistant rice systems

Abstract Gowan Company recently registered benzobicyclon, a WSSA Group 27 herbicide, as postflood option in rice. It is the first 4-hydroxyphenylpyruvate dioxygenase-inhibiting herbicide commercially available mid-southern U.S. rice production. In 2018 and 2019, field experiments were conducted across multiple sites Arkansas to determine if addition of benzobicyclon quizalofop- or imidazolinone-resistant programs would improve weedy control. Across site-years, one application quizalofop, either at 1- 3-leaf stage, followed by applied postflood, provided comparable control two sequential applications which standard program quizalofop-resistant Additionally, treatments containing quizalofop injured ≤5% 28 d after application. all full-season improved when compared early postemergence imazethapyr. both experiments, treated with yielded comparably better than for each system. Findings from this research suggest that use systems could be an additional viable producers.