Syngenta’s Callisto GT post-emergence herbicide has received registration from the U.S. Environmental Protection Agency and all major corn-producing states. 

A premixed formulation of Callisto and Touchdown herbicides, Callisto GT provides post-emergence control of emerged broadleaf weeds and grasses, such as Palmer amaranth, lambsquarters, waterhemp and ragweeds. It also provides residual broadleaf weed control in glyphosate-tolerant corn. Following a post-emergence application in up to 30-inch corn, susceptible weeds take up the herbicide through treated foliage and stop growing soon after application. 

“Resistant weeds have changed growers’ weed control strategies, and glyphosate is now best used in a tank mix to control targeted weeds,” said Gordon Vail, technical product lead with Syngenta. “Market research shows 85% of treated Callisto acres are tank-mixed with glyphosate, so we have formulated this premix to provide added convenience for growers and channel partners.”

Research and Development trials conducted in 2012 showed that Callisto GT provided 95% control of pigweeds, including waterhemp, Palmer amaranth and redroot pigweed. When AAtrex 4L herbicide was added, control increased to 97%.

“Atrazine adds an additional mode of action for weed-resistance management,” Vail said. “If atrazine cannot be used, a dicamba product like NorthStar can be used to provide a different mode of action in the battle against resistant weeds.”