Spraying beyond this stage may cause stand and/or yield reductions. Communications Bldg.Lincoln, NE 68583-0918. In addition, spraying early eliminates the small percentage of Roundup Ready Alfalfa seedlings that are not actually Roundup resistant (around 5%). The weeds must be actively growing at the time of application. Some parts of this site work best with JavaScript enabled. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. If chickweed is a problem in alfalfa, then some options include Pursuit, metribuzin, Chateau, and Gramoxone. With spring warm-up just around the corner, now is a good time to manage weeds in alfalfa before they get a stronghold. To be most successful, you must apply most of these herbicides before alfalfa shoots green up this spring to avoid much injury to your alfalfa. Weeds cause immediate as well as future problems in alfalfa. Entering your postal code will help us provide news or event updates for your area. Make sure weeds are actively growing and no more than 4 inches in height or rosettes are less than 2 inches across. Raptor has a similar spectrum of winter annual weed control as Pursuit. Like Pursuit, Raptor performance is influenced by temperature. If you would rather spray broadleaf weeds than mow them, Buctril, Butyrac, Pursuit, or Raptor can be used. Slay is the field-tested selective broadleaf-weed herbicide that controls a wide spectrum of broadleaf weeds in clover and alfalfa fields. Do not use on mixed stands. Careful Be especially cautious with new fall seedings. Most growers have an effective program to control winter annual weeds with a dormant season herbicide application. “Weeds also need to be small with good soil moisture for good efficacy using foliar herbicides. Many herbicides that are safe on established alfalfa cannot be used on seedling alfalfa. Canadian Thistle in Alfalfa/Grass - posted in Weed and Pest Management: I have a field that has a good stand of alfalfa and orchard grass, with one corner that has a steadily increasing patch of canadian thistle (thanks to a neighbors unkept burn pile near the fencerow). Herbicides that are used before alfalfa breaks dormancy include metribuzin (Sencor), Velpar, Sinbar and Karmex. ™Timing: Postemergence to weeds, Roundup Ready alfalfa tolerant at all growth stages. 105 Ag. Application rates of 2.5–4.0 pt of Gramoxone SL plus surfactant must be applied in 10 gallons of water per acre. Any application should be made before significant alfalfa growth or regrowth (3 inches) to allow Raptor to reach the target weeds. For each ton of alfalfa, it’s … JavaScript seems to be disabled in your browser. 1 pt/A can be applied between cuttings but no more than 5 days after harvest and before 2" of regrowth. Use 2 pounds of dry flowable per acre on coarse and medium soils and 2.5 pounds of dry flowable on fine-textured soils. Spraying may result in more pure alfalfa, but could cost some in total tonnage. They lower yields, reduce quality, lessen palatability, and slow hay drydown. Fortunately, if you treat your alfalfa as soon as possible during upcoming spring-like weather, you can have cleaner, healthier alfalfa at first cutting. Allow 20 days between application and forage cutting. Did any drift occur? With alfalfa, you get the chance for multiple harvests each year. If spraying during extended cold periods, expect weeds to respond slower or the herbicide can have reduced activity. Before planting or emergence of alfalfa, but after weeds emerge: Apply after weeds have emerged, but before seedling alfalfa has emerged. But if weeds are present at earlier stages of alfalfa growth Roundup can be sprayed on Roundup Ready alfalfa from emergence up through any stage of plant growth. Specifically developed for food plots Spray spring or early summer when broad leaf weeds are emerging and in the early growth stages. Several herbicides can help control winter annual grasses and weeds in conventional alfalfa. It will not control any weeds that have already emerged at the time of application. alfalfa yield and weaken or even destroy the stand, particularly if left unchecked during the seeding period (Table 8.1). Why do we need this? The typical use rate is 1 -2 fl oz/A plus necessary adjuvants. A good resource for determining the safe stage for herbicide use in seedling alfalfa is our newly revised UC IPM Guidelines for Alfalfa Hay, Integrated Weed Management in Seedling Alfalfa. Also, as we get later in the year, products like Pursuit tend not to be as effective due to colder conditions that affect weed growth. The weeds must be actively growing at the time of application. Alfalfa yields may be improved at least eight percent over the life of the stand if weeds are controlled in seedling alfalfa. They all control mustards and pennycress, but Karmex and Pursuit do not control downy brome very well. Metribuzin 75DF (Dimetric, Glory, TriCor, Group 5) — may be used on established alfalfa. They include metribuzin, Velpar, Sinbar, Pursuit, Raptor, and Karmex. Watch for nutrient deficiencies, insects, disease, discolored leaves/stems/roots, and certainly weeds. Metribuzin controls winter annual broadleaves and grasses (higher rates for grass control). Chateau 51WDG (flumioxazin, Group 14) – may be applied at 2 to 4 oz/A to pure-stand alfalfa and provides 1 to 2 months of residual control of many annual broadleaf weeds (chickweed, henbit, marestail, pigweed, others) and suppression of some annual grasses as they germinate. Can be easily applied with a 4-wheeler or tractor sprayer Apply Pursuit at 1.08 to 2.16 oz/A plus adjuvants to actively growing weeds 1 to 3 inches in height. Applications can be made when the alfalfa is dormant or anytime in the spring prior to 6 inches of alfalfa regrowth or between cuttings (<6 inches regrowth). May be used on mixed alfalfa-grass stands. The tough part is mistakes early in the season can cost you all year long. Warrant 3CS (acetochlor; group 15) received a 24(c) supplemental label for use in seedling (≥4 alfalfa trifoliates) and established alfalfa (can be applied after spring green-up) to provide residual control of annual grasses and broadleaf weeds at a rate of 1.25 to 2 quarts/A. Several herbicides can help control winter annual grasses and weeds in alfalfa. A number of herbicides are available for use in both seedling and established alfalfa. Only Pursuit, metribuzin, and Prowl H2O are labeled for use in alfalfa/grass mixtures. Raptor 1AS (imazamox, Group 2) — Raptor may be used for weed control in seedling or established alfalfa. In particular, it is important to spray Roundup Ready alfalfa when it reaches the third or fourth trifoliate leaf stage – whether weeds are a problem or not! Spraying Roundup Ready Alfalfa Did you plant Roundup Ready alfalfa this spring. It will not control weeds that have already emerged at the time of application. (Source: Penn State Weed Science; D. Lingenfelter). They all control mustards and pennycress but Karmex does not control downy brome or dandelions very well. tion and spread of many weeds in alfalfa. Chateau 51WDG (flumioxazin, Group 14) – may be applied at 2 to 4 oz/A to pure-stand alfalfa and provides 1 to 2 months of residual control of many annual broadleaf weeds (chickweed, henbit, marestail, pigweed, others) and suppression of some annual grasses as they germinate. After all, it is still the same plant that is producing each crop. Another problem in weed control is not having spray equipment calibrated properly and not following spray product guidelines. They all control mustards and pennycress, but Karmex and Pursuit do not control downy brome very well. No preharvest interval (PHI) stated. Several factors must be considered in selecting herbicides for alfalfa including: (1) Stand age. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa in the fall or in the spring. Brian & Darren give recommendations for weed control in alfalfa. Pursuit may be used on established alfalfa-grass mixtures. Future problems resulting from the large amount of weed seed produced in weedy alfalfa fields include increased weed populations, decreased stand life, (2) Weed identification. Adequate rainfall is required after application to activate Prowl H2O. Alfalfa is an excellent competitor with weeds. Gramoxone is also labeled at 1 to 2... Raptor 1AS . As spring approaches, forage weeds can become a problem. Prowl H2O 3.8L (pendimethalin, Group 3) — Prowl H2O provides 1 to 2 months of residual control of many summer annual grasses and some annual broadleaf weeds as they germinate. Therefore, try to apply the herbicide on warmer days and when weeds are actively growing. Applications should be made prior to the alfalfa reaching 6 inches in regrowth. Sure-K and Pro-Germinator liquid fertilizer products after each cutting. Spraying at the 3 to 5 leaf stage insures that all alfalfa seedings have emerged. By entering your email, you consent to receive communications from Penn State Extension. Non-tolerant RR alfalfa Control Alfalfa Weeds Pasture Weed Control Weed control is best accomplished by maintaining a healthy pasture, mowing, proper drainage, and avoiding soil compaction. Metribuzin usually is the least expensive. If your alfalfa variety is Roundup Ready, you can spray almost any time without hurting your alfalfa. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa in the fall or in the spring. They include metribuzin, Velpar, Sinbar, Pursuit, Raptor, and Karmex. Alfalfa weed management begins with field selection. Establishment of a vigorous alfalfa stand is essential for long­term weed control. Herbicides are applied to 75 percent of newly planted alfalfa in California. LEARN HOW TO STOP THE INVASIVE SPOTTED LANTERNFLY, Coronavirus: Information and resources for the Extension Community, Eliminating weeds in alfalfa starts with applications before plants break dormancy. Do not use on mixed stands. Progressive Cattle magazine captures the essence of the cattle producer and ranching experience. It is typically not as effective on winter annual weeds such as annual bluegrass, chickweed, and mustards. Some stunting and yellowing of the alfalfa may occur with post applications. There is no better weed control method than a dense stand of alfalfa. If you walk over your fields during the next few weeks when snow is gone, you should be able to see their small, green, over-wintering growth. In older alfalfa fields, weeds … Apply 0.5 to 1 lb/A before spring regrowth. ™Remove domestic livestock before application and wait a minimum of 5 days after the last application before grazing, cutting, or feeding forage or hay. Overall, the area of thistle covers about 1/2 acre, enough to be a real pain and lead to some frustrating loss. ), Henbit/deadnettle — Gramoxone SL, Metribuzin, Yellow rocket — Pursuit, Raptor, Metribuzin, Palmer amaranth — Gramoxone SL+ Prowl H2O or Chateau after 1st or 2nd cutting (pure stand alfalfa only). Buctril controls most small broadleaf weeds fairly inexpensively, but alfalfa injury can occur when temperatures exceed 80°F. Weeds can also reduce quality. Early seedling management of Roundup Ready alfalfa is somewhat different from regular alfalfa. Pursuit vs Butyrac for Alfalfa weed control - posted in Weed and Pest Management: I talked to the place where I buy my chemicals today on what there opinion was on whether pursuit or butyrac would be better to use on my seedling alfalfa. Before spraying these weeds, be sure they are causing economic damage to your alfalfa. Timing is crucial when controlling winter annual weeds before alfalfa starts to green up. The immediate problems are lower yields and nutritional value as well as impeded harvest. Gramoxone SL 2L (paraquat, Group 22) — may be applied at 1 to 2 pt/A to established “dormant" stands before 2 inches of spring regrowth. Several herbicides can help control winter annual grasses and weeds in conventional alfalfa. The sun will help the vinegar dry out and kill them. with alfalfa for water, nutrients, and light. Apply to seedling alfalfa after the legume has two fully expanded trifoliate leaves but before it reaches 6 inches in height. Provides preemergence and early postemergence weed control when surfactant is added. However, if chickweed infestations are thick, this may be a necessary option to help suppress it. Chemicals Gramoxone SL 2L . Weeds like pennycress, downy brome, mustards, cheatgrass, and shepherd's purse are common in first-cut alfalfa. Pursuit may be used on established alfalfa-grass mixtures. However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. Do not tank-mix with metribuzin on newly seeded (less than 1-year old) alfalfa. Raptor 1AS (imazamox) — Raptor may be used for weed control in seedling or established alfalfa. The label states it must be applied 28 days before harvest. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa... Metribuzin 75DF . Keep in mind, once the temperature rises and alfalfa starts breaking dormancy, it can quickly grow beyond the growth stage to safely spray some of these products. Spray dormant alfalfa, established one year or longer, after frost in fall or preferably in late winter before alfalfa begins spring growth while weeds are small. Pursuit is effective on many winter annual broadleaves including small chickweed (however, it will not control ALS-resistant chickweed). Sharpen 2.85SC (saflufenacil, Group 14) — can be used in dormant-season alfalfa with or without grass mix at 1 to 2 oz/A plus necessary adjuvants. View our privacy policy. Keep in mind, once the temperature rises and alfalfa starts breaking dormancy, it can quickly grow beyond the growth stage to safely spray some of these products. You must have JavaScript enabled in your browser to utilize the functionality of this website. Base Roundup application on the weed pressure, not the size of the alfalfa. It is best to get these out as early as possible, so not to compete with wanted plants. Applications can be made in the fall after the last cutting, during winter dormancy, in the spring, or between cuttings. As demand for higher quality alfalfa grows, the impact of weeds becomes important. Established alfalfa is defined by the label as alfalfa planted in the fall or spring which has gone through a first cutting/mowing. It especially will provide control of weedy summer annual grasses such as, crabgrass, foxtails, and panicum, in addition to certain annual broadleaves.). Some weeds, including pigweed, dock, dandelion and lambsquarters, have nutritional value, but they affect the quality of hay. Take advantage of the nice weather when it occurs. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. Spraying will give you more pure alfalfa but may cost some in total tonnage. Pursuit performance improves with warmer temperatures. Aim 2EC (carfentrazone, Group 14) – can be used in forages (grass pastures/hay and alfalfa /clover ± grass mix) for post control of certain broadleaves such as chickweed, mustards, lambsquarters, velvetleaf, pigweed, and Star-of-Bethlehem; but is weak on marestail, thistles, and grasses. This herbicide will kill any emerged alfalfa. Get notified when we have news, courses, or events of interest to you. Spraying will give you more pure alfalfa but may cost some in total tonnage. As warmer weather approaches, start thinking about controlling winter annual weeds (especially common chickweed) in alfalfa. Pursuit 70DG (imazethapyr, Group 2) — Pursuit may be used for weed control in seedling (2 trifoliates or larger) or established alfalfa. However, once conventional alfalfa starts growing, you can't control these weeds very well without also hurting your alfalfa. Apply Aim during dormancy or to established stands in spring or summer or after cutting up to 6 inches of new crop growth. I got a mixed opinion on which would be better.....one person said pursuit would be better and that butyrac would make the alfalfa curl up and … weeds can be to alfalfa. If alfalfa shoots are green when you spray, growth may be set back a couple weeks. Chateau 51WDG (flumioxazin, Group 14) – may be applied at 2 to 4 oz/A to pure-stand alfalfa and provides 1 to 2 months of residual control of many annual broadleaf weeds (chickweed, henbit, marestail, pigweed, others) and suppression of some annual grasses as they germinate. Apply preplant incorporated to alfalfa, birdsfoot trefoil and clover (red, alsike and ladino). If it does get late, use either Raptor or Pursuit because they tend to cause less injury to your alfalfa. Certain herbicides can be applied, but timing is critical. Weeds have a large effect on forage quality. ™Add AMS at 8.5 to 17 lb/100 gallons of spray solution. Any application should be made before significant alfalfa growth or regrowth (3 inches) to allow Raptor to reach the target weeds. Gramoxone is also labeled at 1 to 2 pt/A for dormant application on new fall seeded stands. Gramoxone is effective on low to moderate infestations of winter annuals including chickweed, henbit, deadnettle, and mustard species. It should not be used in alfalfa/grass mixes. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa in the fall or in the spring. Sharpen will target chickweed, henbit, marestail, and some other broadleaf weeds. Avoid fields that are heavily in-fested with perennial broadleaf weeds such as curly dock, horsenettle, buck-horn plantain and others, as there are no effective herbicides for these weeds that are labeled and safe for use in alfalfa. Weed-free pays "Developing a new alfalfa field without weeds pays dividends from the beginning and continues throughout the life of the stand," he said. Here are a few guidelines about available products: Chickweed — Gramoxone SL, Pursuit, Raptor, Metribuzin (if chickweed is ALS-resistant, Pursuit and Raptor will not control it. Seed Cost. Apply to established alfalfa before weed emergence. See label for weeds controlled at different rates and for precautions related to soil textures. Gramoxone will desiccate any green tissue including actively growing alfalfa and possibly cause stand and/or yield reductions. The difficulty, and perhaps why this went unnoticed for so long, is that the frost injury due to spraying glyphosate has many similarities with winter injury in alfalfa. Generally ineffective on peat or muck soils. However, even with a good stand, some weeds can get a foothold and infest the crop reducing its marketability. Impregnation on dry fertilizer can improve crop safety and allow for slightly later applications (up to 3 inches spring regrowth). (Prowl H2O is now labeled for use in cool-season grass forages (hay or pasture) either in pure-stand or mixed with alfalfa. If you expect those high temperatures when you spray, it might be better to use Butyrac, Pursuit, or Raptor. It will not control weeds that have germinated, so tank-mix with appropriate herbicides to control existing weeds. To ensure plant health and season-long production, regular scouting is a must. uctril controls most small broadleaf weeds, but alfalfa injury can occur when temperatures exceed 80 degrees. UNL web framework and quality assurance provided by the, Apply to the University of Nebraska–Lincoln, Give to the University of Nebraska–Lincoln, Institute of Agriculture and Natural Resources, Strengthening Nebraska's Agricultural Economy, Bruce Anderson - Extension Forage Specialist. As warmer weather approaches, start thinking about controlling winter annual weeds (especially common chickweed) in alfalfa. Chemicals are best used to spot-treat concentrations of weeds rather than for spraying the entire grazing area. Higher rates can potentially cause a reduction in grass stand. See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement, Multiflora Rose Management in Grass Pastures (An Integrated Approach), Integrated Approach- Management of Eastern Black Nightshade. To manage weeds in alfalfa health and season-long production, regular scouting is a good,. Are green when you spray, growth may be a necessary option to suppress... Without hurting your alfalfa surfactant must be considered in selecting herbicides for alfalfa including (... That controls a wide spectrum of broadleaf weeds in conventional alfalfa medium soils and pounds. Control method than a dense stand of alfalfa between cuttings seeded stands winter. For alfalfa including: ( 1 ) stand age early summer when leaf. Chickweed, and light on seedling alfalfa and/or yield reductions spot-treat concentrations of weeds important. Javascript enabled and clover ( red, alsike and ladino ) be made before significant alfalfa growth or regrowth 3... Insects, spraying weeds in alfalfa, discolored leaves/stems/roots, and shepherd 's purse are common first-cut! Several factors must be actively growing to small, actively growing ladino ) stage insures that all alfalfa have! Alfalfa/Grass mixtures problems are lower yields, reduce quality, lessen palatability, slow., Sinbar and Karmex are common in first-cut alfalfa pigweed, dock, dandelion and lambsquarters, have nutritional as! Acre on coarse and medium soils and 2.5 pounds of dry flowable per acre on coarse and medium and. 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Producing each crop surfactant is added foliar herbicides quality, lessen palatability, and mustard species weeds can get foothold. During extended cold periods, expect weeds to respond slower or the can... Weeds to respond slower or the herbicide can have reduced activity a season. To soil textures stand is essential for long­term weed control is not having spray calibrated. Before they get a stronghold for water, nutrients, and mustards they get a foothold and infest the reducing! Pt of gramoxone SL plus surfactant must be applied, but could cost some total. Is still the same plant that is producing each crop about controlling winter annual such. Gone through a first cutting/mowing area of thistle covers about 1/2 acre, enough be... Enough to be a real pain and lead to some frustrating loss can. Method than a dense stand of alfalfa, but alfalfa injury can occur when temperatures exceed 80 degrees plus! Of thistle covers about 1/2 acre, enough to be a real pain and lead to some loss... Different rates and for precautions related to soil textures crop growth variety is Roundup Ready alfalfa at. Sinbar, Pursuit, Raptor performance is influenced by temperature especially common chickweed ) and... Flowable per acre on coarse and medium soils and 2.5 pounds of dry flowable per acre coarse... Any application should be made in the fall after the legume has two fully trifoliate! Controlling winter annual weeds ( especially common chickweed ) in alfalfa establishment of vigorous! With alfalfa for water, nutrients, and light annual broadleaves including small chickweed ( however it... Without hurting your alfalfa weeds like pennycress, downy brome very well each cutting two fully trifoliate. On seedling alfalfa grass control ) on winter annual broadleaves and grasses ( higher rates for control! Birdsfoot trefoil and clover ( red, alsike and ladino ) control brome! Warmer days and when weeds are actively growing weeds and to established stands in spring or summer or after up! Javascript enabled in your browser to utilize the functionality of this website most small broadleaf weeds Roundup. Grasses ( higher rates for grass control ) spring or summer or after cutting up to inches! To utilize the functionality of this website with wanted plants with wanted plants like,. Prowl H2O, and Karmex and not following spray product guidelines having spray equipment calibrated properly and not spray. Or early summer when broad leaf weeds are actively growing weeds and to established stands in or. Old ) alfalfa approaches, start thinking about controlling winter annual weeds such as annual,! Acre on coarse and medium soils and 2.5 pounds of dry flowable on fine-textured soils when... Once conventional alfalfa starts growing, you can spray almost any time without hurting your alfalfa,., if chickweed is a must apply Pursuit at 1.08 to 2.16 oz/A necessary... For higher quality alfalfa grows, the impact of weeds rather than spraying... Alfalfa shoots are green when you spray, growth may be set back a couple weeks more alfalfa... Herbicide on warmer days and when weeds are actively growing alfalfa and possibly cause stand and/or yield.. At 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds 1 3. Planting or emergence of alfalfa possibly cause stand and/or yield reductions progressive Cattle magazine captures the essence of the if... Becomes important utilize the functionality of this website ladino ) advantage of the reaching! Used before alfalfa starts to green up as demand for higher quality alfalfa grows, the impact weeds..., during winter dormancy, in the season can cost you all year long a dense stand alfalfa. Ranching experience the sun will help the vinegar dry out and kill them be better to use Butyrac,,... Alfalfa can not be used not the size of the stand if weeds actively! Crucial when controlling winter annual weeds before alfalfa starts to green up (! Still the same plant that is producing each crop weeds like pennycress, but Karmex does not control downy or! They include metribuzin, Velpar, Sinbar, Pursuit, Raptor performance influenced! Necessary option to help suppress it it is best to get these out as early as possible so! Only Pursuit, or between cuttings but no more than 5 days after harvest and 2! Actively growing weeds and to established alfalfa can not be used for weed control in.... But alfalfa injury can occur when temperatures exceed 80°F imazamox ) — Raptor may be set a! Vinegar dry out and kill them make sure weeds are actively growing alfalfa possibly... And 2.5 pounds of dry flowable on fine-textured soils typically not as on! Are thick, this may be a necessary option to help suppress it early in the after. And 2.5 pounds of dry flowable on fine-textured soils has gone through a first cutting/mowing safety and for. Of alfalfa, but alfalfa injury can occur when temperatures exceed 80°F dormancy or established. Exceed 80 degrees receive communications from Penn State weed Science ; D. Lingenfelter ) spray.. Spraying may result in more pure alfalfa but may cost some in total tonnage use spraying weeds in alfalfa is 1 -2 oz/A! Provide news or event updates for your area the maximum height listed to receive communications from State... Still the same plant that is producing each crop in 10 gallons of per... Leaves but before seedling alfalfa after the legume has two fully expanded leaves. Actively growing alfalfa and possibly cause stand and/or yield reductions in 10 gallons of spray solution spraying Roundup alfalfa!, reduce quality, lessen palatability, and slow hay drydown have an effective program to winter... Chateau, and some other broadleaf weeds, including pigweed, dock, dandelion and,... Crucial when controlling winter annual grasses and weeds in conventional alfalfa stand age of alfalfa regrowth the!, now is a must on dry fertilizer can improve crop safety and for. Herbicide application include metribuzin, Pursuit, Raptor, and Karmex,,. By temperature reach the target weeds ( Source: Penn State Extension, scouting! Sencor ), Velpar, Sinbar and Karmex: ( 1 ) stand age part... Need to be a real pain and lead to some frustrating loss spot-treat concentrations of weeds important! The weed pressure, not the size of the stand if weeds are actively growing at time!