Effective dose of atrazine required to complement tolpyralate for annual weed control in corn

Abstract Tolpyralate is an herbicide that usually mixed with atrazine for broad-spectrum weed control in corn. Previous research has provided information on the effective dose (ED) of tolpyralate applied alone and a 1:33.3 mixture atrazine; however, commercially at 30 to 40 g ai ha −1 minimum 560 atrazine. Therefore, five field trials were conducted over 3 yr (2019 2021) determine ED complement achieve 80%, 90%, 95% seven species 2, 4, 8 wk after application (WAA). was doses ranging from 50 2,000 . At WAA, velvetleaf, common ragweed, lambsquarters, wild mustard below label commercial label, 430 520 , which supports use In contrast, redroot pigweed required 1,231 WAA. barnyardgrass green foxtail giant ( Setaria spp.) not controlled by or co-applied any evaluated this study. The results study conclude + highly efficacious several 130 but higher another may be improve grass species.