`Merit' and `Silver Queen' sweet corn plants were treated with nicosulfuron and primisulfuron herbicides at rates of 0.035 and 0.039 kg ai ha-1, respectively. These herbicides were applied either over the top postemergence or directed post emergence. Over the top postemergence applications killed all of the `Merit' plants, but did not injure `Silver Queen' plants. All treatments provided greater than 90 % control of johnson grass and fall panicum.
In a separate experiment, `Silver Queen', `Incredible', `How Sweet It Is', `Pinnacle', `Sweetie 76', and `Landmark' showed slight injury, while `Silverado' showed moderate injury 2 weeks after application of a postemergence treatment of either nicosulfuron or primisulfuron. However, the plants soon outgrew this injury and yields were not reduced due to herbicide treatments.