Issue No. 1, Article 5/March 22, 2012
New Herbicides for 2012
Only a few new herbicide products are commercially available for 2012. One new active ingredient--pyroxasulfone--is included in the list, but there are no herbicides with novel sites of action. Please be sure to consult the most recent product labels for more complete information and product use guidelines and restrictions.
OpTill Pro (saflufenacil + imazethapyr and dimethenamid) combines the active ingredients of OpTill and Outlook in a dual-chambered jug that will treat 20 acres of soybean per jug. The product provides the equivalent of 2 ounces of OpTill (Sharpen + Pursuit) and 10 fluid ounces of Outlook for burndown control of existing vegetation and soil-residual control of certain annual weed species. Include MSO (1%) and AMS (1-2%) or UAN (1.25-2.5%) to improve burndown activity. Applications must be made before plants begin to emerge and at least 30 days before planting when applied to coarse-textured soils with less than 2% organic matter.
Armezon 2.8SL (topramezone) contains the same active ingredient as Impact. Armezon may be applied at 0.75 fluid ounce per acre to corn up to 45 days before harvest. Weed control is often improved when Armezon is applied in combination with atrazine and MSO.
Autumn Super 51WDG (iodosulfuron + thiencarbazone) can be applied 30 or 60 days before planting field corn or soybean, respectively, to control emerged weed species. The product is positioned primarily for application in the fall following crop harvest for burndown and residual control of winter annual weed species.
Liberty is the new name for the product sold as Ignite in 2011. The formulation of Liberty is identical to that of Ignite. The total amount of glufosinate that can be applied in-crop to glufosinate-resistant soybean has been increased to 65 fluid ounces of Liberty per acre per season.
Basis Blend 30WSG (rimsulfuron + thifensulfuron) is a new formulation (blended) of Basis 75WDG that can be applied preemergence or postemergence in corn. Use rate conversations between the two formulations include these:
0.33 oz Basis = 0.825 oz Basis Blend
0.50 oz Basis = 1.25 oz Basis Blend
0.67 oz Basis = 1.67 oz Basis Blend
Zemax 3.67ZC (mesotrione + S-metolachlor + safener) is a new formulation that will replace Camix for preemergence and postemergence use in corn and grain sorghum. Applications can be made up to 14 days before planting and until corn reaches 30 inches or the 8-leaf stage. Zemax may be applied up to 21 days before planting sorghum that was seed-treated with a commercial safener.
Gramoxone SL (paraquat) is a new formulation that replaces Gramoxone Inteon.
Fierce 76WG (flumioxazin + pyroxasulfone) contains the active ingredient in Valor along with the new active ingredient pyroxasulfone. Fierce must be applied at least 7 days before planting no-till or reduced tillage corn. Currently, Fierce is not registered for use in soybean and soybean is not a rotational crop listed on the label, so any corn fields treated with Fierce in 2012 must be planted back to corn in 2013.--Aaron Hager