The Environmental Protection Agency recently registered Syngenta’s Acuron GT, a post-emergence herbicide for use on glyphosate-tolerant corn. State registrations are pending.
Acuron GT combines the active ingredients in Halex GT corn herbicide — glyphosate, mesotrione and S-metolachlor — with the active ingredient bicyclopyrone added. This helps helps Acuron GT provide enhanced post-emergence control of yield-robbing weeds and longer-lasting residual in glyphosate-tolerant corn.
“Acuron GT has performed exceptionally well in field trials, averaging greater than 90% post-emergence control on all weed categories – large-seeded broadleaves and small-seeded broadleaves,” Ryan Lins, Syngenta research and development scientist in Minnesota, said in a news release. “In particular, its higher-level control of large-seeded broadleaves such as giant ragweed, morningglory and cocklebur, and pigweed species like Palmer amaranth and waterhemp, really sets Acuron GT apart from all other post-emergence-plus-residual herbicides.”
The combination of four active ingredients and three sites of action in Acuron GT also helps growers manage difficult weeds longer into the season, fully protecting yield potential and minimizing the weed seed bank for next year’s crop. The herbicide contains the active ingredients from the Weed Science Society of America’s Groups 15, 27 and 9.
“Compared to Halex GT, field trials show Acuron GT provided an 8% increase in residual control of annual grass and small-seeded broadleaf weeds, and a 14% increase in residual control of Palmer amaranth when evaluated 42 to 56 days after treatment2,” says Scott Cully, Syngenta R&D scientist in Illinois. “The fact that Acuron GT may help growers achieve almost 90% control of weeds six to eight weeks after post-emergence application is a true testament to the residual power of bicyclopyrone, the additional unique active ingredient in Acuron GT compared to Halex GT2.”
Across 16 head-to-head replicated trials in glyphosate-tolerant corn, Acuron GT outyielded other post-emergence-plus-residual herbicides, according to the news release.
For optimum yield protection, Syngenta recommends using Acuron GT early post-emergence, before weeds reach 4 inches in height, in a planned two-pass program following preemergence applications of Lumax EZ, Lexar EZ, Bicep II Magnum, Bicep Lite II Magnum or Dual II Magnum herbicides.