This is a good … Atrazine or simazine at > 1 lb/A will be problematic for legumes and mustards unless lots of rainfall occurs after application. d; If < 4.875 oz/ac applied, if > 5.7 oz/ac applied then 18 months. < 0.75 lb/A may allow for good establishment of most legume cover crops, mustards, and annual ryegrass. If the hay has legumes in it, it has not been treated with any of these herbicides. Please check the label for the current and … Atrazine may dissipate more rapidly in no-till compared with tilled conditions. g; May be applied on young seedling only. Atrazine applied for weed control in corn results in residue the following year or for several years when applied at 1.5 to three pounds (active rate) per acre. 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. Herbicide carryover is a common question for specialty crop growers, particularly those who rent land for production. Herbicide half-life General Rule •Short - < 30 days ... •Atrazine: alfalfa = clovers > radish = ryegrass/timothy > hairy vetch = pea > oats > wheat = barley = rye •Mesotrione: clovers = alfalfa … Corn and millet are tolerant to atrazine while other crops vary in susceptibility. ... clovers or alfalfa. f; If applied 2 lb atrazine or more, then 18 month interval . First emerging leaves may stick together, but seedlings usually recover after the first rain or irrigation. 1 lb per acre ... Control plot was left with no RECLAIM – beans showed severe damaged from Atrazine carryover in control plot. All of the factors described above – herbicide characteristics, soil characteristics, weather conditions, and rotational crop planted – interact with each other to cause or avoid carryover injury. Atrazine, at as little as 0.5 lb AI/A, will improve the speed, spectrum and consistency of the weed control. The sensitivity of the rotational crop is another factor to consider. 15 months if more than 2 lb atrazine applied or dry summer. The previously mentioned researchers in … acetochlor & atrazine Forage, Feed, and Grazing Restrictions: No restrictions on the label. Interveinal chlorosis … I recommend farmers apply herbicide … To meet the growing weed control challenges, new residual herbicide products (Group 4, 27 and 14) are popular for difficult to control weeds. If atrazine carryover is likely in a field, it may be best to plant corn (or sorghum) that year to avoid potential problems. If you are in an area that is cold and dry, be more conservative than the below numbers. 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. This chart is for your reference only. 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. Example: Atrazine (several product names), cyanazine (Bladex), simazine (Princep), hexazinone (Velpar) Crop Use: Corn and alfalfa; Movement: Upward from root to vine; Potato Injury: Carry-over injury has generally occurred in Nebraska when metribuzin at its high, labeled rates is also used on a field after triazine-treated corn in Nebraska. Package Mix: Yes 2.7 lb/gal & 1.34 lb/gal Company Trade Name Common Name * Possibility of crop injury from atrazine carryover. 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. For example on a sensitivity scale from "more sensitive to "less sensitive: ryegrass = oats > wheat = alfalfa >> soybean >> sorghum > corn. Herbicide Carryover. Figure 8. 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. Atrazine applied to field corn. Atrazine carryover has been observed this spring, as well as drift from adjacent cornfields. c; If <4.875 oz/ac applied, 6 months if > 5.7 oz/ac applied. High soil pH (pH >7.0) will increase atrazine persistence. ... Is carryover a concern with Laudis? The approximate ranking of crops from most to least tolerant is corn, sorghum, millet, flax, soybean, barley, wheat, oat, sunflower, canola/mustard, alfalfa… Kentucky has had dry seasons in the past, yet atrazine injury to rotational crops was seldom an issue. 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. Herbicides vary in their potential persistence and carryover. e; If receive 15 inches of precipitation/year. Injury symptoms only occur after the cotyledons and first leaves emerge. • Half life too long - carryover to following crop ... Atrazine 60 days 120 days 180 days 240 days. Atrazine and atrazine-containing products, which are used often on row crops, also can damage the alfalfa. Farmers who planted cover crops last fall need to terminate them before planting corn or soybeans, says a University of Missouri Extension weed specialist. Some alfalfa stand reduction and stunting may occur. Herbicides are available for pre-plant incorporated and post-emergence applications for weed and grass control in alfalfa. It may be impregnated or applied in liquid fertilizer. Laudis™ and Dual II Magnum™ are considered to have low carryover potential (Curran and Lingenfelter, 2012). The adjuvant system must still be used when atrazine is in the tank, and MSO is the recommended surfactant for optimal weed control. Application flexibility allows for AAtrex 4L to be applied preplant surface, preplant incorporated, pre-emergence, or post-emergence. 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. Do not use on alfalfa if any atrazine has been applied … Corn herbicides Pyroxasulfone (Zidua) and metolachlor (Dual, etc) can hinder annual ryegrass establishment. 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. Atrazine Carryover • High pH (> 7.5) –Fewer H + available – Atrazine maintains neutral charge – Less adsorbtion to soil – More available to plant R. Hartzler. It is a member of monofluorobenzenes, an aromatic amide and a member of thiadiazoles. Herbicide families with persistent active ingredients include triazines (atrazine), phenylureas (diuron), sulfonylureas (chlorimuron), imadazolinones (imazaquin), dinitroanilines (trifluralin), isoxazolidinones (clomazone), and diphenylethers (fomesafen). No damage to alfalfa – excellent stand. Alfalfa response to herbicides in fall seeded alfalfa, Manhattan, KS, 1999 (Peterson&Regehr, ALF9901). 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 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. Injury is typically most noticeable on unifoliate and first trifoliate leaves, and appears as interveinal chlorosis and necrosis (Figure 8). 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. A liquid formulation, AAtrex ® 4L provides season-long control of many broadleaf weeds and some grasses in approved crops. deficient, atrazine may cause injury to susceptible crops the fol-lowing year. For more than half a century, atrazine has been a mainstay of corn, sorghum and sugar cane farmers for its proven control of a broad range of destructive weeds. Atrazine, Callisto™, Laudis™, and the 1x rate of Dual II Magnum™ did not affect any of the cover crop species relative to their controls. Irrigated after RECLAIM applied and before alfalfa planted. 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