Tolerance of Three Sweet Corn Hybrids to a Postemergence Tankmix of Nicosulfuron plus Bromoxynil

Abstract

Trials were conducted over 2 years at three locations in Ontario to determine the tolerance of three sweet corn hybrids to postemergence application of nicosulfuron (25 and 50 g·ha–1), bromoxynil (280 and 560 g·ha–1), and nicosulfuron plus bromoxynil (25 + 280 g·ha–1 and 50 + 560 g·ha–1). All hybrids showed injury 7 days after treatment (DAT). The crop largely recovered from the injury in most treatments, as indicated by the ratings completed 14 and 28 DAT. However injury from the tankmix of nicosulfuron plus bromoxynil at both rates still appeared to be synergistic at 7, 14, and 28 DAT. Visual injury, height reductions and yield loss in the nicosulfuron plus bromoxynil (50 + 560 g·ha–1) treatment were more severe than in the other herbicide treatments. Yield of BSS5362 was significantly decreased in the nicosulfuron (50 g·ha–1) and nicosulfuron plus bromoxynil (50 + 560 g·ha–1) but was not affected by any other herbicide-hybrid combination. Caution must be exercised when using this tankmix combination, as there is potential to cause significant visual injury, height reductions and yield loss.