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New Herbicides and Label Changes for 2002

March 22, 2002

Option 35WG (foramsulfuron) registration is expected sometime this spring. Option contains a new active ingredient that will be labeled for postemergence use in field corn. Use rates will range from 1.5 to 1.75 ounces per acre and may be applied up through V5 corn. Applications must include a methylated seed oil and a nitrogen fertilizer. Option controls several annual grass and broadleaf weed species. Since Option is an ALS inhibitor, it will not provide satisfactory control of ALS-resistant weed biotypes. Tank mixtures with herbicides having other modes of action will be needed to control these species.


Raptor 1S (imazamox) received registration for use in alfalfa. Raptor should be applied early postemergence before weeds exceed 3 inches in height. Use rates range between 4 and 6 fluid ounces per acre for seedling or established alfalfa grown for forage, hay, or seed. There should be at least 20 days between applications of Raptor and cutting or feeding alfalfa for forage or hay, and an interval of 70 days between application and harvest of alfalfa seed used for food or feed.

Backdraft SL 1.35L (imazaquin + glyphosate) will replace Backdraft 1.5L. The change in formulation results in a use rate change to 2.5 quarts per acre. This rate delivers 2.14 ounces per acre of Scepter 70DG and 1 quart per acre of Roundup Original. Postemergence applications should be made only to Roundup Ready soybeans.

Dow AgroSciences

There are a couple of label changes for Hornet 68.5WDG (flumetsulam + clopyralid). The rotational restriction is now 10.5 months for forage grasses and snap beans. There has also been a change in the rainfastness from 6 to 2 hours.


Accent Gold WDG 78.1WDG (nicosulfuron + rimsulfuron + clopyralid + flumetsulam) is a new formulation of Accent Gold that contains Hornet WDG, which replaced the original Hornet. Accent Gold WDG is applied at 3.5 ounces per acre, which provides the same activity as 2.9 ounces per acre of the original Accent Gold. Some confusion may exist as Accent Gold inventories are replaced with Accent Gold WDG, so be aware of which formulation you are using.


Aim 1.9EW (carfentrazone), a liquid formulation, will replace the Aim 40WDG dry formulation. The Aim EW use rate of 0.5 fluid ounce per acre is equivalent to the 0.33 ounce per acre rate of the dry formulation. Aim is labeled for field corn, seed corn, popcorn, corn silage, sweet corn, grain sorghum, soybeans, wheat, barley, and oats.


Yukon 67.5WG (halosulfuron + dicamba) state registration is expected this spring. The common use rate of Yukon is 4 ounces per acre, which delivers 2/3 ounce per acre of Permit and 4 ounces per acre of Banvel. Yukon controls both large- and small-seeded broadleaf weeds, with the added benefit of yellow nutsedge control. Since Yukon contains dicamba, special care needs to be taken when applications are made near dicamba-sensitive species.


Callisto (mesotrione) registration was granted during the 2001 growing season, and this product is summarized in issue 11 of the 2001 Pest Management & Crop Development Bulletin. One major change to the Callisto label affects rotational crop restrictions. Small grains can still be planted 120 days after application, and soybeans, sorghum, potatoes, sunflowers, tobacco, and sweet corn can be planted the season following application. However, the rotation interval has been extended to 18 months for sugar beets, peas, dry beans, snap beans, cucurbits, red clover, alfalfa, and all other rotational crops. In addition, there are several 2ee labels associated with this product. These address additional tank-mix partners and the use of several soil-applied insecticides prior to Callisto use postemergence.


Phoenix 2EC is a new formulation of lactofen, which is the active ingredient in Cobra. Phoenix contains 2 pounds per gallon of lactofen plus an adjuvant system. Use rates range from 8 to 12.5 fluid ounces per acre, and applications should include 0.125 to 0.25% v/v non-ionic surfactant. A crop oil concentrate (COC) may be used at 1 pint per acre if weeds are under stress due to hot and dry conditions. The addition of a COC will cause soybean leaf burn similar to Cobra. Phoenix with a non-ionic surfactant will also cause some leaf bronzing or speckling; however, it may not be to the same extent as Cobra. The rainfastness of Phoenix is 2 hours compared with Cobra's 1/2 hour.

Valor 51WDG (flumioxazin) received registration during the 2001 growing season, and this product is summarized in issue 4 of the 2001 Pest Management & Crop Development Bulletin. Valor may be used for burndown applications at a use rate of 1 to 3 ounces per acre with an adjuvant or used from 2 to 3 ounces per acre soil-applied for residual control of summer annual species.--Christy Sprague and Aaron Hager

Author: Aaron Hager Christy Sprague

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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