PERFORMANCE OF HERBICIDE MIXTURES AND SEQUENTIAL TREATMENTS FOR BENGHAL DAYFLOWER MANAGEMENT

Resumo

Background: Benghal dayflower is a widely distributed weed in Brazil, known for its tolerance to glyphosate, requiring the use of alternative herbicides and more complex control strategies.

Objective: Evaluate different auxin-mimicking herbicides in combination with glyphosate for the control of Benghal dayflower, as well as the efficacy of glufosinate alone or in association with PPO inhibitors in sequential applications.

Methods: Two experiments were conducted in Ponta Grossa (PR-Brazil), using a randomized block design. The first experiment evaluated different auxinic herbicides combined with glyphosate, including 2,4-D, triclopyr, halauxifen, fluroxypyr, and dicamba. Additionally, treatments with glyphosate alone and a non-treated control were assessed. The second experiment evaluated Benghal dayflower control with glyphosate + 2,4-D followed by sequential glufosinate applications alone or with PPO inhibitors saflufenacil, tiafenacil, carfentrazone, and flumioxazin. In both experiments, visual evaluations of weed control percentage relative to the untreated control were performed.

Results: All treatments combining glyphosate with auxin-mimicking herbicides showed statistically significant improvements compared to glyphosate alone, with the 2,4-D + glyphosate mixture standing out. The addition of PPO inhibitors did not improve Benghal dayflower control compared to glufosinate alone. However, sequential applications enhanced control, achieving an average of approximately 93% compared to only 75% in the non-sequential treatment.

Conclusions: The use of auxinic herbicides in mixture with glyphosate, mainly 2,4-D, in the burndown application and sequential treatment of glufosinate alone or combined with PPO inhibitors are strategies that enhance Benghal dayflower control.