Abstract
There is little information on the biologically effective rate of halosulfuron applied postemergence (POST) for the control of broadleaf weeds in corn under Ontario environmental conditions. Six field trials were conducted over a two-year period (2014, 2015) to determine the biologically effective rate of halosulfuron POST for the control of velvetleaf, pigweed species, common ragweed, common lambsquarters and Eastern black nightshade in corn. Based on regression analysis, the predicted halosulfuron rates required to cause 5, 10 and 20% corn injury were 53, 138 and >560 g ai ha-1 at 1 WAA, 109, 276 and >560 g ai ha-1 at 2 WAA and 493, >560 and >560 g ai ha-1 at 4 WAA, respectively. The predicted halosulfuron rates applied POST for 95% control of velvetleaf, pigweed species, common ragweed, common lambsquarters and Eastern black nightshade were 10-13, 35-143, 25-57, >560 and >560 g ai ha-1, respectively. The predicted halosulfuron rates applied POST to reduce velvetleaf, pigweed species, common ragweed and...
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