atrazine carryover alfalfa

Atrazine and atrazine-containing products, which are used often on row crops, also can damage the alfalfa. • Half life too long - carryover to following crop ... Atrazine 60 days 120 days 180 days 240 days. Package Mix: Yes 2.7 lb/gal & 1.34 lb/gal Company Trade Name Common Name * Possibility of crop injury from atrazine carryover. Laudis™ and Dual II Magnum™ are considered to have low carryover potential (Curran and Lingenfelter, 2012). 15 months if more than 2 lb atrazine applied or dry summer. Some alfalfa stand reduction and stunting may occur. A liquid formulation, AAtrex ® 4L provides season-long control of many broadleaf weeds and some grasses in approved crops. Herbicides vary in their potential persistence and carryover. The adjuvant system must still be used when atrazine is in the tank, and MSO is the recommended surfactant for optimal weed control. ... clovers or alfalfa. Alfalfa response to herbicides in fall seeded alfalfa, Manhattan, KS, 1999 (Peterson&Regehr, ALF9901). deficient, atrazine may cause injury to susceptible crops the fol-lowing year. The previously mentioned researchers in … Atrazine applied to field corn. Herbicide carryover in hay, manure, compost and grass clippings Many farmers and home gardeners have reported damage to vegetable and flower crops after applying horse or livestock manure, compost, hay or grass clippings to the soil. f; If applied 2 lb atrazine or more, then 18 month interval . Flufenacet is an aromatic amide that is acetamide in which the amino hydrogens have been replaced by a propan-2-yl and 4-fluorophenyl groups while the methyl hydrogen is replaced by a [5-(trifluoromethyl)-1,3,4-thiadiazol-2-yl]oxy group. No damage to alfalfa – excellent stand. 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. I recommend farmers apply herbicide … Figure 8. Application flexibility allows for AAtrex 4L to be applied preplant surface, preplant incorporated, pre-emergence, or post-emergence. 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. The risk will be reduced if atrazine was applied early spring and had some rain to move into the soil profile. 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. d; If < 4.875 oz/ac applied, if > 5.7 oz/ac applied then 18 months. Irrigated after RECLAIM applied and before alfalfa planted. Herbicide carryover is a common question for specialty crop growers, particularly those who rent land for production. This chart is for your reference only. Atrazine or simazine at > 1 lb/A will be problematic for legumes and mustards unless lots of rainfall occurs after application. 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. The sensitivity of the rotational crop is another factor to consider. If atrazine carryover is likely in a field, it may be best to plant corn (or sorghum) that year to avoid potential problems. Corn herbicides Pyroxasulfone (Zidua) and metolachlor (Dual, etc) can hinder annual ryegrass establishment. Injury symptoms only occur after the cotyledons and first leaves emerge. It has a role as an environmental contaminant, a xenobiotic and a herbicide. Atrazine Carryover • High pH (> 7.5) –Fewer H + available – Atrazine maintains neutral charge – Less adsorbtion to soil – More available to plant R. Hartzler. 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. To meet the growing weed control challenges, new residual herbicide products (Group 4, 27 and 14) are popular for difficult to control weeds. acetochlor & atrazine Forage, Feed, and Grazing Restrictions: No restrictions on the label. If the hay has legumes in it, it has not been treated with any of these herbicides. For example on a sensitivity scale from "more sensitive to "less sensitive: ryegrass = oats > wheat = alfalfa >> soybean >> sorghum > corn. This is a good … g; May be applied on young seedling only. Herbicide half-life General Rule •Short - < 30 days ... •Atrazine: alfalfa = clovers > radish = ryegrass/timothy > hairy vetch = pea > oats > wheat = barley = rye •Mesotrione: clovers = alfalfa … 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. 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 you are in an area that is cold and dry, be more conservative than the below numbers. < 0.75 lb/A may allow for good establishment of most legume cover crops, mustards, and annual ryegrass. It may be impregnated or applied in liquid fertilizer. Please check the label for the current and … Do not use on alfalfa if any atrazine has been applied … Interveinal chlorosis … It is a member of monofluorobenzenes, an aromatic amide and a member of thiadiazoles. Injury is typically most noticeable on unifoliate and first trifoliate leaves, and appears as interveinal chlorosis and necrosis (Figure 8). 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. 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. 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. 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. 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 Herbicide families with persistent active ingredients include triazines (atrazine), phenylureas (diuron), sulfonylureas (chlorimuron), imadazolinones (imazaquin), dinitroanilines (trifluralin), isoxazolidinones (clomazone), and diphenylethers (fomesafen). The approximate ranking of crops from most to least tolerant is corn, sorghum, millet, flax, soybean, barley, wheat, oat, sunflower, canola/mustard, alfalfa… ... Is carryover a concern with Laudis? 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. Herbicide Carryover. 1 lb per acre ... Control plot was left with no RECLAIM – beans showed severe damaged from Atrazine carryover in control plot. Corn and millet are tolerant to atrazine while other crops vary in susceptibility. Atrazine, at as little as 0.5 lb AI/A, will improve the speed, spectrum and consistency of the weed control. High soil pH (pH >7.0) will increase atrazine persistence. Atrazine, Callisto™, Laudis™, and the 1x rate of Dual II Magnum™ did not affect any of the cover crop species relative to their controls. First emerging leaves may stick together, but seedlings usually recover after the first rain or irrigation. Atrazine may dissipate more rapidly in no-till compared with tilled conditions. Herbicides are available for pre-plant incorporated and post-emergence applications for weed and grass control in alfalfa. 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. e; If receive 15 inches of precipitation/year. 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. 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. 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. And first leaves emerge at > 1 lb/A will be problematic for legumes and mustards lots... And some grasses in approved crops or simazine at > 1 lb/A will be if... Treated with any of these herbicides no RECLAIM – beans showed severe damaged from atrazine carryover laudis™ and Dual Magnum™! 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