ARE GLYPHOSATE AND GLUFOSINATE-AMMONIUM TOTALLY SELECTIVE FOR TRANSGENIC MAIZE CONTAINING THE CP4-EPSPS AND PAT GENES?

To achieve high crop yields, an advanced weed management program is required. Maize with cp4-epsps and pat genes is tolerant to glyphosate and glufosinate-ammonium herbicides and has been a tool used for weed control. However, there is a demand for new studies to assess how tolerant it is and to avoid yield losses. The objective of this study was to assess the selectivity of the 2B810PW hybrid, which has the cp4-epsps and pat genes, subjected to applications of glyphosate (gly) and glufosinateammonium (glu), both isolated and combined, at two different rates, during three crop years, in two municipalities in Paraná state. A randomized block design, with four replications, was used. Some measured variables, such as plant height, showed few differences between crop years and locations, while others, like percentage of seed germination and yield, showed no differences (P ≤ 0.05). This demonstrates that the hybrid is resistant to the application of glufosinate-ammonium and glyphosate herbicides, isolated or combined, and these molecules can provide more options for weed control in crops of maize containing the cp4-epsps and pat genes.