• PPO inhibitors (Group 14): TMCadet , Cobra®, Flexstar®, Ultra Blazer®. Herbicide carryover injury on cover crop species will vary from year to year, largely due to rainfall and time of application. Flexstar and other similar generic products containing the active ingredient fomesafen are popular POST products in both conventional and the array or herbicide tolerant soybeans because it is effective against some of the tougher to control weeds. Condition: Carryover of herbicide due mostly to lack of moisture for breakdown; misapplication Atrazine or Metribuzin Mode of Action: Photosynthetic Inhibitor Click on an image to display it in larger detail. With atrazine, higher rates applied in June were problematic. Herbicide carryover injury on cover crop species will vary from year to year, largely due to rainfall and time of application. 2. A few farmers believe (and some are correct) that they have Flexstar carryover stunting corn. There is a … Spray solutions of FLEXSTAR®GT Herbicide should be mixed, stored and applied only in stainless steel, fibreglass, plastic and plastic-lined steel containers. Most small grains are fine but legumes and radish can be problematic. Flexstar can be applied later in the season and up to 45 days prior to soybean harvest. interval that must elapse before rotational crops can be planted. Herbicide characteristics influencing carryover potential. Fomesafen is a group 14 herbicide (PPO inhibitor), and the active ingredient in Reflex, Flexstar, Prefix, Marvel and other products. Most herbicides primarily degrade by soil microbial processes, which are reduced by dry conditions. The potential for herbicide carryover varies widely based on the product used, when and where it was applied, and what the weather has been like since the time of application. Products containing the active ingredient fomesafen (Flexstar/GT/Reflex) have a 10 month rotation restriction to corn. Flexstar Carryover to Corn Products containing the active ingredient fomesafen (Flexstar/GT/Reflex) have a 10 month rotation restriction to corn. Dry soil conditions following post-emergence applications in 1999 were conducive for persistence of fome-safen. In some instances, the leaf veins almost appear clear or transparent. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. Over the past two days, I’ve received numerous calls of herbicide carryover injury from applications of herbicides that contain fomesafen made last season. Late-season applications can often make satisfying the corn rotational interval difficult, especially when the following spring is dry enough to allow for early corn planting. Flexstar – Due to carryover concerns, the full rate of Flexstar varies from area to area. Consider the soybean herbicide program you used in 2017 before you plant a fall cover crop. If symptoms appear, corn quickly outgrows the By Kevin Bradley Numerous people have called to report carryover injury from applications of herbicides that contain fomesafen made last season. Herbicide Handbook, 10th Edition. Fomesafen is a group 14 herbicide (PPO inhibitor), and the active ingredient in Reflex, Flexstar, Prefix, Marvel and other products. The symptoms are characteristic of Flexstar or fomesafen carryover. As well OMAFRA’s own Mike Cowbrough addresses the impact and reasons for herbicide carryover commonly prevalent in 2020 and how to identify 2,4-D injury in non-target crops. Fomesafen has the longest soil-residual activity of the three post-emergence diphenyl ether herbicides (Blazer and Cobra being the others). The symptoms are characteristic of Flexstar or fomesafen carryover. If your soybean herbicide last season contained the active ingredient fomesafen, you may want to take a stroll through your cornfield. Fomesafen is broken down by microbes. Fomesafen is registered for use in ND only east of Hwy 281. DO NOT MIX, STORE OR APPLY FLEXSTAR GT HERBICIDE OR SPRAY SOLUTIONS OF FLEXSTAR GT HERBICIDE IN GALVANIZED STEEL OR UNLINED STEEL (EXCEPT STAINLESS STEEL) CONTAINERS OR SPRAY TANKS. Postemergence herbicide applications with PPO-inhibiting herbicides may result in soybean injury, specifically during hot and humid weather. Products containing the active ingredient fomesafen (Flexstar/GT/Reflex) have a 10 month rotation restriction to corn. In the past few days, Kevin Bradley, University of Missouri (MU) Extension weed specialist, has received numerous calls in Missouri regarding carryover injury in corn that received fomesafen applications last season. In almost every case of fomesafen (Flexstar, Prefix, others) carryover, a July or later application was made in 2017. The use of Flexstar for weed control in soybeans has increased since its introduction. Over the past two days, I’ve received numerous calls of herbicide carryover injury from applications of herbicides that contain fomesafen made last season. Willowood Fomesafen 1.88SL is a selective herbicide which may be applied pre-plant, pre-emergence or post-emergence for control or suppression of broadleaf weeds, grasses and sedges in soybeans. The evaluated cover crops’ sensitivity to herbicide carryover, from most to least sensitive are: Tillage radish, Austrian winter pea, crimson clover and annual ryegrass (tie), winter wheat and winter oats (tie) and hairy vetch and cereal rye (tie). Willowood Fomesafen 1.88SL is a selective herbicide which may be applied pre-plant, pre-emergence or post-emergence for control or suppression of broadleaf weeds, grasses and sedges in soybeans. 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