Um seletividade e eficácia de herbicidas em pré e pós-emergência no feijoeiro-comum

Abstract

With the expansion of bean cultivation in Brazil, the availability of registered herbicides is limited. This study evaluated the selectivity and efficacy of herbicides in pre- and post-emergence in common bean, carried out in Conchal-SP, with a completely randomized experimental design, eight treatments in pre-emergence and nine in post-emergence, with four replications. In pre-emergence, clomazone, sulfentrazone and pyroxasulfone were highly selective, with low phytotoxicity and effective weed control, resulting in higher yield. Oxyfluorfen, imazapique and diclosulam caused moderate to severe injuries, compromising growth and reducing yields, with oxyfluorfen being the most effective in weed control among the non-promising ones. In post-emergence, clomazone and S-metolachlor were selective, with good weed control. Clomazone recovered quickly, while S-metolachlor caused mild phytotoxicity. Chlorimuron-ethyl, chlorasulam-methyl and nicosulfuron had low efficiency, and imazapique showed high phytotoxicity, but good weed control. It is concluded that clomazone, pyroxasulfone and sulfentrazone are potential selective and effective herbicides for use in common bean cultivation.