Uso de inibidores e protetores na identificação do mecanismo de tolerância do feijoeiro a herbicidas inibidores da Protox

Abstract

The use of non-registered pre-emergent herbicides for common bean cultivation may be a new alternative to detect new herbicides that may be efficient in weed management. The objective of this study was to determine if herbicide metabolism plays an important role in bean tolerance to pre-emergence herbicides. Two common bean cultivars were used, being BRSMG Talismã tolerant and IAC Milênio sensitive to saflufenacil and sulfentrazone herbicides. To verify the tolerance of the bean, the organophosphate insecticides Malathion and Clorpirifós inhibitors of herbicide metabolizing enzymes were used, where the chlorpyrifos applied in the sowing furrow proved to be more efficient. And the use of Menfenpyr and Naphthalic Anhydride protectors to increase the activity of herbicide metabolizing enzymes, where Menfenpyr in seed treatment was more efficient. Both products performed better when combined with the sulfentrazone herbicide. After the preliminary test, a final test was carried out with the most efficient products, showing that the metabolization is a process that conditions the tolerance of bean to protox inhibition herbicides.