e; If receive 15 inches of precipitation/year. Atrazine for corn and sorghum Cyanazine (Bladex) for corn Simazine (Princep) for corn Metribuzin (Lexone, Sencor) for alfalfa and soybeans Hexazinone (Velpar) for alfalfa ; Injury Symptoms: Photosynthesis inhibitors do not prevent seedlings from germinating or emerging. Herbicide families with persistent active ingredients include triazines (atrazine), phenylureas (diuron), sulfonylureas (chlorimuron), imadazolinones (imazaquin), dinitroanilines (trifluralin), isoxazolidinones (clomazone), and diphenylethers (fomesafen). If the hay has legumes in it, it has not been treated with any of these herbicides. Kentucky has had dry seasons in the past, yet atrazine injury to rotational crops was seldom an issue. Figure 8. It may be impregnated or applied in liquid fertilizer. ... Is carryover a concern with Laudis? c; If <4.875 oz/ac applied, 6 months if > 5.7 oz/ac applied. Application flexibility allows for AAtrex 4L to be applied preplant surface, preplant incorporated, pre-emergence, or post-emergence. Matter-of-fact atrazine carry over was a concern when deciding to plant a 17 acre field, hopefully within the next month, with alfalfa, orchard grass and Barenburg Green Spirit Italian Rye grass as a cover crop. Atrazine Carryover • High pH (> 7.5) –Fewer H + available – Atrazine maintains neutral charge – Less adsorbtion to soil – More available to plant R. Hartzler. The sensitivity of the rotational crop is another factor to consider. 1 lb per acre ... Control plot was left with no RECLAIM – beans showed severe damaged from Atrazine carryover in control plot. Even a one-pound rate often causes crop injury the following year in lighter-textured, high-pH soil if soil moisture has been limiting, Berglund observes. If you look at the rotation crop restrictions for corn and soybean herbicides in the Penn State Agronomy Guide (Tables 2.2-17 and 2.4-15), you will see that many products limit rotation to alfalfa and/or the clovers as well as some of the small grains. If you are in an area that is cold and dry, be more conservative than the below numbers. deficient, atrazine may cause injury to susceptible crops the fol-lowing year. A liquid formulation, AAtrex ® 4L provides season-long control of many broadleaf weeds and some grasses in approved crops. Herbicide Carryover. Atrazine or simazine at > 1 lb/A will be problematic for legumes and mustards unless lots of rainfall occurs after application. Atrazine’s effectiveness and safety is well documented throughout the United States and around the world, with nearly 7,000 scientific studies conducted on the product. It has a role as an environmental contaminant, a xenobiotic and a herbicide. Atrazine carryover has been observed this spring, as well as drift from adjacent cornfields. Farmers who planted cover crops last fall need to terminate them before planting corn or soybeans, says a University of Missouri Extension weed specialist. If atrazine carryover is likely in a field, it may be best to plant corn (or sorghum) that year to avoid potential problems. The following article, written by Kristen Callow, OMAFRA's Weed Management Program Lead for Horticulture, with excerpts from Nebraska Cooperative Extension Publication G74-113A, outlines a general test that can help determine if atrazine remains in soil. Injury symptoms only occur after the cotyledons and first leaves emerge. For cover crops to accomplish their intended goals, they must establish well; establish-ment of cover crops can be compromised by use of residual herbicides, the herbicide activity in the soil for a period of time after application and are applied to the preceding cash crop. New Seeding Alfalfa —Evaluate Herbicide Carryover Corn, soybean and even wheat weed control chemistry has changed in the last few years to meet the challenges of herbicide resistant weeds. acetochlor & atrazine Forage, Feed, and Grazing Restrictions: No restrictions on the label. Corn herbicides Pyroxasulfone (Zidua) and metolachlor (Dual, etc) can hinder annual ryegrass establishment. Atrazine Carryover "Rule of Thumb" A crude rule of thumb often used in the moist Northeast US and Canada is the "10% atrazine carryover rule": 10% of the applied active ingredient will remain in the soil the spring of the year following application. This chart is for your reference only. g; May be applied on young seedling only. d; If < 4.875 oz/ac applied, if > 5.7 oz/ac applied then 18 months. Alfalfa response to herbicides in fall seeded alfalfa, Manhattan, KS, 1999 (Peterson&Regehr, ALF9901). < 0.75 lb/A may allow for good establishment of most legume cover crops, mustards, and annual ryegrass. First emerging leaves may stick together, but seedlings usually recover after the first rain or irrigation. It is a member of monofluorobenzenes, an aromatic amide and a member of thiadiazoles. Herbicides vary in their potential persistence and carryover. Atrazine applied to field corn. Application Alfalfa Total Herbicide Time Rate Injury Yield Forage (%) (lb/A) (lb/A) Treflan PPI 1.5 pt 12 901 7535 Pursuit+NIS+N FP 1.44 oz 0 2707 3392 Raptor+NIS+N FP 4 oz 0 3038 3281 Interveinal chlorosis … Having said that, the risk of crop injury due to atrazine carryover is still an issue that we need to consider on a case by case basis. I recommend farmers apply herbicide … Irrigated after RECLAIM applied and before alfalfa planted. Injury is typically most noticeable on unifoliate and first trifoliate leaves, and appears as interveinal chlorosis and necrosis (Figure 8). Atrazine, at as little as 0.5 lb AI/A, will improve the speed, spectrum and consistency of the weed control. Flufenacet is an aromatic amide that is acetamide in which the amino hydrogens have been replaced by a propan-2-yl and 4-fluorophenyl groups while the methyl hydrogen is replaced by a [5-(trifluoromethyl)-1,3,4-thiadiazol-2-yl]oxy group. To meet the growing weed control challenges, new residual herbicide products (Group 4, 27 and 14) are popular for difficult to control weeds. The adjuvant system must still be used when atrazine is in the tank, and MSO is the recommended surfactant for optimal weed control. Atrazine, Callisto™, Laudis™, and the 1x rate of Dual II Magnum™ did not affect any of the cover crop species relative to their controls. For example on a sensitivity scale from "more sensitive to "less sensitive: ryegrass = oats > wheat = alfalfa >> soybean >> sorghum > corn. Please check the label for the current and … Herbicides are available for pre-plant incorporated and post-emergence applications for weed and grass control in alfalfa. 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