Halauxifen-Methyl+Diclosulam: New Option to Control Conyza spp. Prior Soybean Sowing

Control of Conyza spp. prior to soybean sowing has faced difficulties because of the resistance cases in Brazil, hence new herbicides as halauxifen-methyl + diclosulam are important to manage this specie. The objective of this research was to evaluate the effectiveness of the herbicide halauxifen-me...

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Veröffentlicht in:Advances in Weed Science 2019, Vol.37
Hauptverfasser: KRENCHINSKI, F.H., PEREIRA, V.G.C., ZOBIOLE, L.H.S., ALBRECHT, A.J.P., ALBRECHT, L.P., PETERSON, M.
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Sprache:eng
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Zusammenfassung:Control of Conyza spp. prior to soybean sowing has faced difficulties because of the resistance cases in Brazil, hence new herbicides as halauxifen-methyl + diclosulam are important to manage this specie. The objective of this research was to evaluate the effectiveness of the herbicide halauxifen-methyl + diclosulam applied at pre-planting of soybean. The experiments were set up in three locations in Paraná State, Brazil, in the 2015/2016 season. The herbicide halauxifen-methyl + diclosulam was associated with glyphosate and compared to other commercial herbicide to Conyza spp. control. The application occurred 15 days before soybean sowing, in plants of Conyza spp. with an average height of 20-35 cm in the three areas. None of the treatments promoted Conyza spp. control above 90%, when soybean was at the V1 stage; however, the findings showed that halauxifen-methyl + diclosulam promoted better control in comparison to the other treatments. The control reached >90% at V3 soybean development stage, in which treatments containing glyphosate + halauxifen-methyl + diclosulam were more effective than the other treatments. In addition, treatments with glyphosate + halauxifen-methyl + diclosulam decreased dry matter content of Conyza spp. between 87 and 93%, depending on the location, when compared to the control. The burndown treatment to Conyza spp. with glyphosate + halauxifen-methyl + diclosulam did not decrease soybean yield, and it was always higher than the untreated check. RESUMO: O controle de Conyza spp. antecedendo a semeadura da soja tem apresentado dificuldades no Brasil devido à presença de casos de resistência. Assim, novos herbicidas, como halauxifen-methyl + diclosulam, são importantes no manejo dessa espécie. O objetivo desta pesquisa foi avaliar a eficácia do herbicida halauxifen-methyl + diclosulam aplicado em dessecação pré-plantio da soja. Os experimentos foram instalados em três localidades no Estado do Paraná, Brasil, na safra de 2015/2016. O herbicida halauxifen-methyl + diclosulam foi associado ao glyphosate e comparado com outros herbicidas encontrados no mercado para o controle de buva; a aplicação ocorreu 15 dias antes da semeadura da soja, em plantas de Conyzaspp. com altura média de 20-35 cm, nas três áreas. Nenhum dos tratamentos promoveu controle de Conyzaspp., superior a 90%, quando a soja se encontrava no estádio V1; entretanto, os resultados demonstraram que halauxifen-methyl + diclosulam promoveu melhor controle em relação aos
ISSN:0100-8358
1806-9681
1806-9681
2675-9462
DOI:10.1590/s0100-83582019370100059