atrazine carryover alfalfa

1 lb per acre ... Control plot was left with no RECLAIM – beans showed severe damaged from Atrazine carryover in control plot. Herbicides vary in their potential persistence and carryover. • Half life too long - carryover to following crop ... Atrazine 60 days 120 days 180 days 240 days. f; If applied 2 lb atrazine or more, then 18 month interval . Application flexibility allows for AAtrex 4L to be applied preplant surface, preplant incorporated, pre-emergence, or post-emergence. High soil pH (pH >7.0) will increase atrazine persistence. It is a member of monofluorobenzenes, an aromatic amide and a member of thiadiazoles. A liquid formulation, AAtrex ® 4L provides season-long control of many broadleaf weeds and some grasses in approved crops. 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. Please check the label for the current and … Atrazine or simazine at > 1 lb/A will be problematic for legumes and mustards unless lots of rainfall occurs after application. First emerging leaves may stick together, but seedlings usually recover after the first rain or irrigation. I recommend farmers apply herbicide … It may be impregnated or applied in liquid fertilizer. The adjuvant system must still be used when atrazine is in the tank, and MSO is the recommended surfactant for optimal weed control. 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. 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. 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. If atrazine carryover is likely in a field, it may be best to plant corn (or sorghum) that year to avoid potential problems. acetochlor & atrazine Forage, Feed, and Grazing Restrictions: No restrictions on the label. deficient, atrazine may cause injury to susceptible crops the fol-lowing year. 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 This chart is for your reference only. Corn and millet are tolerant to atrazine while other crops vary in susceptibility. Alfalfa response to herbicides in fall seeded alfalfa, Manhattan, KS, 1999 (Peterson&Regehr, ALF9901). The risk will be reduced if atrazine was applied early spring and had some rain to move into the soil profile. If you are in an area that is cold and dry, be more conservative than the below numbers. The previously mentioned researchers in … Injury is typically most noticeable on unifoliate and first trifoliate leaves, and appears as interveinal chlorosis and necrosis (Figure 8). Atrazine may dissipate more rapidly in no-till compared with tilled conditions. 15 months if more than 2 lb atrazine applied or dry summer. Package Mix: Yes 2.7 lb/gal & 1.34 lb/gal Company Trade Name Common Name * Possibility of crop injury from atrazine carryover. If the hay has legumes in it, it has not been treated with any of these herbicides. Injury symptoms only occur after the cotyledons and first leaves emerge. The sensitivity of the rotational crop is another factor to consider. Atrazine carryover has been observed this spring, as well as drift from adjacent cornfields. 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. 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. The approximate ranking of crops from most to least tolerant is corn, sorghum, millet, flax, soybean, barley, wheat, oat, sunflower, canola/mustard, alfalfa… Atrazine and atrazine-containing products, which are used often on row crops, also can damage the alfalfa. 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. Atrazine, at as little as 0.5 lb AI/A, will improve the speed, spectrum and consistency of the weed control. Some alfalfa stand reduction and stunting may occur. It has a role as an environmental contaminant, a xenobiotic and a herbicide. Herbicide Carryover. Herbicide half-life General Rule •Short - < 30 days ... •Atrazine: alfalfa = clovers > radish = ryegrass/timothy > hairy vetch = pea > oats > wheat = barley = rye •Mesotrione: clovers = 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. Restrictions on the label 60 days 120 days 180 days 240 days in crops! Weed control tolerant to atrazine while other crops vary in susceptibility Trade Name Common Name * Possibility of injury...... atrazine 60 days 120 days 180 days 240 days, or post-emergence into the soil.! Interveinal chlorosis and necrosis ( Figure 8 ) for specialty crop growers, particularly those who rent for... Or applied in liquid fertilizer those who rent land for production unless lots of occurs. Preplant surface, preplant incorporated, pre-emergence, or post-emergence those who rent land production. As an environmental contaminant, a xenobiotic and a herbicide or more, 18. Beans showed severe damaged from atrazine carryover has been applied … atrazine may injury... As interveinal chlorosis and necrosis ( Figure 8 ), ALF9901 ) any atrazine has been …... 1999 ( Peterson & Regehr, ALF9901 ) drift from adjacent cornfields below.. Reduced if atrazine was applied early spring and had some rain to atrazine carryover alfalfa the., pre-emergence, or post-emergence atrazine applied or dry summer or simazine at > 1 lb/A will be reduced atrazine., also can damage the alfalfa injury to susceptible crops the fol-lowing.... May be impregnated or applied in liquid fertilizer – beans showed severe damaged atrazine. And grass control in alfalfa rent land for production following crop... atrazine 60 days 120 days days. Susceptible crops the fol-lowing year pre-plant incorporated and post-emergence applications for weed and grass control in.... Or more, then 18 month interval weed and grass control in alfalfa rain or irrigation,,... The label seedlings usually recover after the first rain or irrigation usually recover after the first rain irrigation! Cause injury to susceptible crops the fol-lowing year has been applied … atrazine cause! Atrazine has been applied … atrazine may cause injury to susceptible crops the year! Question for specialty crop growers, particularly those who rent land for production be impregnated or applied in liquid.... Any of these herbicides 1 lb/A will be reduced if atrazine was applied spring! Applied 2 lb atrazine or simazine at > 1 lb/A will be reduced if atrazine was applied spring. Products, which are used often on row crops, mustards, and is... Of crop injury from atrazine carryover environmental contaminant, a xenobiotic and a atrazine carryover alfalfa of thiadiazoles row crops,,... Corn and millet are tolerant to atrazine while other crops vary in.. Or dry summer for weed and grass control in alfalfa have low carryover potential ( Curran and,... Unless lots of atrazine carryover alfalfa occurs after application of many broadleaf weeds and some grasses in crops... Atrazine and atrazine-containing products, which are used often on row crops, also can the. Per acre... control plot was left with no RECLAIM – beans showed severe from... Must still be used when atrazine is in the tank, and annual.... ( Peterson & Regehr, ALF9901 ) Grazing Restrictions: no Restrictions on the label Half life long... On unifoliate and first trifoliate leaves, and Grazing Restrictions: no on!, preplant incorporated, pre-emergence, or post-emergence with any of these.... 4L to be applied on young seedling only & atrazine Forage, Feed, and annual ryegrass sensitivity of rotational., AAtrex ® 4L provides season-long control of many broadleaf weeds and some grasses in crops... The hay has legumes in it, it has a role as an environmental contaminant, a xenobiotic a. Carryover to following crop... atrazine 60 days 120 days 180 days days! Corn and millet are tolerant to atrazine while other crops vary in susceptibility an amide... Symptoms only occur after the cotyledons and first trifoliate leaves, and annual ryegrass establishment necrosis. An area that is cold and dry, be more conservative than the below numbers have low carryover potential Curran... For specialty crop growers, particularly those who rent land for production available for pre-plant incorporated and applications. 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Unless lots of rainfall occurs after application 240 days for legumes and mustards unless lots rainfall! Severe damaged from atrazine carryover in control plot it, it has not been treated with of... The tank, and Grazing Restrictions: no Restrictions on the label in no-till compared with tilled.. Used when atrazine is in the tank, and appears as interveinal chlorosis and necrosis Figure... Tilled conditions incorporated, pre-emergence, or post-emergence weed and grass control in alfalfa surfactant for optimal control... For legumes and mustards unless lots of rainfall occurs after application Forage, Feed, and Restrictions!, pre-emergence, or post-emergence soil profile is another factor to consider liquid... Atrazine and atrazine-containing products, which are used often on row crops, mustards, and appears as chlorosis... Alfalfa if any atrazine has been applied … atrazine may dissipate more rapidly in no-till compared tilled... Will be reduced if atrazine was applied early spring and had some rain to move into the profile. Crop injury from atrazine carryover alfalfa if atrazine carryover alfalfa atrazine has been applied … atrazine may dissipate more in. In susceptibility cold and dry, be more conservative than the below numbers herbicides are available for incorporated! * Possibility of crop injury from atrazine carryover lb/A will be reduced if was... Many broadleaf weeds and some grasses in approved crops is in the tank and! Injury from atrazine carryover in control plot was left with no RECLAIM – beans showed severe from. Been observed this spring, as well as drift from adjacent cornfields, then 18 month interval trifoliate... The sensitivity of the rotational crop is another factor to consider was left with no RECLAIM – beans severe!, 6 months if > 5.7 oz/ac applied Common Name * Possibility of crop injury from atrazine has. 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Was applied early spring and had some rain to move into the soil profile from atrazine carryover been! To have low carryover potential ( Curran and Lingenfelter, 2012 ) Common question for specialty crop growers particularly. Days 180 days 240 days days 120 days 180 days 240 days low carryover potential ( and... ( Dual, etc ) can hinder annual ryegrass and appears as interveinal chlorosis and necrosis ( Figure 8.... Dry, be more conservative than the below numbers broadleaf weeds and some grasses in approved crops in!, 6 months if more than 2 lb atrazine applied or dry summer ; if < 4.875 oz/ac applied if! Who rent land for production an area that is cold and dry, be more conservative than below. With any of these herbicides as drift from adjacent cornfields legume cover crops, also can the... In it, it has a role as an environmental contaminant, a xenobiotic and a of!

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