Herbicidas pré-emergentes para manejo de milho voluntário RR® na cultura da soja

Alternatives for volunteer corn RR ® management need further knowledge in the product scope with residual effect, mainly for use in pre-emergence of the soybean RR ® . This paper evaluated the performance of residual herbicides to control this species, when applied in soybean using the method "plant-apply". The experiment was carried in the municipality of Santa Maria/RS, crop season 2015/16; evaluating herbicides applied in pre-emergence of soybean crop and corn RR ® . The experimental design was randomized blocks with eight treatments and four replications were evaluated inhibition of emergence of corn plants and injury on emerged plants. Sequential application responses were also addressed. Herbicides tested: flumioxazin, chlorimuron-ethyl, imazaquin, and sulfentrazone; as associations these herbicides with flumioxazin, in sequential applications, reporting if there were synergistic effects. The best control of RR ® volunteer corn was obtained with the imazaquin herbicide, which reduced the emergence of RR ® corn plants by 90% and injured 97.5% of those that emerged. However, imazaquin caused symptoms of phytotoxicity in the soybean crop, which did not measure yield losses in this work. The association in sequential applications of imazaquin and flumioxazin, showed additive control effect on maize.