Controle de azevém em trigo com herbicidas aplicados em pré e/ou pós-emergência das espécies

Abstract

Wheat is one of the main winter crops in Southern Brazil, and proper weed control is necessary to prevent productivity losses and maintain grain quality. Thus, the objective of this study was to evaluate the efficacy of pre-emergent herbicide applications, either alone or in combination with post-emergent treatments, for ryegrass control in wheat cultivation. The experiment was conducted in a randomized block design with four replications in the experimental area of the Federal University of Southern Frontier - UFFS, Erechim campus. The following variables were assessed: ryegrass control, number of spikes per area (m²), test weight (kg hL-1 ), thousand grain weight (g), and grain yield (kg ha-1 ). The results indicate that the herbicides, particularly pinoxaden, demonstrated high efficacy in controlling ryegrass without compromising the productivity components of the wheat crop. On the other hand, S-metolachlor showed good control as a pre-emergent herbicide but was highly dependent on post-emergent management. The application modalities, whether pre- and/or post-emergent, should be used as an important strategy for managing ryegrass infestation in wheat cultivation.