Several herbicides can help control winter annual grasses and weeds in alfalfa. Some stunting and yellowing of the alfalfa may occur with post applications. 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. tion and spread of many weeds in alfalfa. Seed Cost. Applications should be made prior to the alfalfa reaching 6 inches in regrowth. Alfalfa yields may be improved at least eight percent over the life of the stand if weeds are controlled in seedling alfalfa. Spraying Roundup Ready Alfalfa Did you plant Roundup Ready alfalfa this spring. The weeds must be actively growing at the time of application. Future problems resulting from the large amount of weed seed produced in weedy alfalfa fields include increased weed populations, decreased stand life, Base Roundup application on the weed pressure, not the size of the alfalfa. Be especially cautious with new fall seedings. There is no better weed control method than a dense stand of alfalfa. Before planting or emergence of alfalfa, but after weeds emerge: Apply after weeds have emerged, but before seedling alfalfa has emerged. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa... Metribuzin 75DF . Slay is the field-tested selective broadleaf-weed herbicide that controls a wide spectrum of broadleaf weeds in clover and alfalfa fields. However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. In older alfalfa fields, weeds … The label states it must be applied 28 days before harvest. Pursuit may be used on established alfalfa-grass mixtures. Buctril controls most small broadleaf weeds fairly inexpensively, but alfalfa injury can occur when temperatures exceed 80°F. 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. ™Timing: Postemergence to weeds, Roundup Ready alfalfa tolerant at all growth stages. ), 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). With alfalfa, you get the chance for multiple harvests each year. It should not be used in alfalfa/grass mixes. Sure-K and Pro-Germinator liquid fertilizer products after each cutting. Spraying will give you more pure alfalfa but may cost some in total tonnage. 1 pt/A can be applied between cuttings but no more than 5 days after harvest and before 2" of regrowth. 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. 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. This herbicide will kill any emerged alfalfa. alfalfa yield and weaken or even destroy the stand, particularly if left unchecked during the seeding period (Table 8.1). The tough part is mistakes early in the season can cost you all year long. JavaScript seems to be disabled in your browser. (2) Weed identification. Applications can be made in the fall after the last cutting, during winter dormancy, in the spring, or between cuttings. Brian & Darren give recommendations for weed control in alfalfa. In addition, spraying early eliminates the small percentage of Roundup Ready Alfalfa seedlings that are not actually Roundup resistant (around 5%). Get notified when we have news, courses, or events of interest to you. (Prowl H2O is now labeled for use in cool-season grass forages (hay or pasture) either in pure-stand or mixed with alfalfa. 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. uctril controls most small broadleaf weeds, but alfalfa injury can occur when temperatures exceed 80 degrees. Careful Do not use on mixed stands. Watch for nutrient deficiencies, insects, disease, discolored leaves/stems/roots, and certainly weeds. Chemicals are best used to spot-treat concentrations of weeds rather than for spraying the entire grazing area. Communications Bldg.Lincoln, NE 68583-0918. Most growers have an effective program to control winter annual weeds with a dormant season herbicide application. Pursuit may be used on established alfalfa-grass mixtures. Certain herbicides can be applied, but timing is critical. 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. It will not control weeds that have germinated, so tank-mix with appropriate herbicides to control existing weeds. 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. Non-tolerant RR alfalfa Control By entering your email, you consent to receive communications from Penn State Extension. Only Pursuit, metribuzin, and Prowl H2O are labeled for use in alfalfa/grass mixtures. Weeds have a large effect on forage quality. They lower yields, reduce quality, lessen palatability, and slow hay drydown. Alfalfa Weeds Pasture Weed Control Weed control is best accomplished by maintaining a healthy pasture, mowing, proper drainage, and avoiding soil compaction. Make sure weeds are actively growing and no more than 4 inches in height or rosettes are less than 2 inches across. 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 like pennycress, downy brome, mustards, cheatgrass, and shepherd's purse are common in first-cut alfalfa. No preharvest interval (PHI) stated. 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. Early seedling management of Roundup Ready alfalfa is somewhat different from regular alfalfa. Several herbicides can help control winter annual grasses and weeds in conventional alfalfa. Can be easily applied with a 4-wheeler or tractor sprayer 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. It will not control weeds that have already emerged at the time of application. 105 Ag. 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. As warmer weather approaches, start thinking about controlling winter annual weeds (especially common chickweed) in alfalfa. Herbicides are applied to 75 percent of newly planted alfalfa in California. Establishment of a vigorous alfalfa stand is essential for long­term weed control. Gramoxone is also labeled at 1 to 2... Raptor 1AS . Higher rates can potentially cause a reduction in grass stand. 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). 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. ™Add AMS at 8.5 to 17 lb/100 gallons of spray solution. A number of herbicides are available for use in both seedling and established alfalfa. Gramoxone will desiccate any green tissue including actively growing alfalfa and possibly cause stand and/or yield reductions. They include metribuzin, Velpar, Sinbar, Pursuit, Raptor, and Karmex. Timing is crucial when controlling winter annual weeds before alfalfa starts to green up. Raptor 1AS (imazamox) — Raptor may be used for weed control in seedling or established alfalfa. Spraying beyond this stage may cause stand and/or yield reductions. Take advantage of the nice weather when it occurs. Progressive Cattle magazine captures the essence of the cattle producer and ranching experience. Any application should be made before significant alfalfa growth or regrowth (3 inches) to allow Raptor to reach the target weeds. It will not control any weeds that have already emerged at the time of application. 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. weeds can be to 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. with alfalfa for water, nutrients, and light. However, even with a good stand, some weeds can get a foothold and infest the crop reducing its marketability. You must have JavaScript enabled in your browser to utilize the functionality of this website. However, if chickweed infestations are thick, this may be a necessary option to help suppress it. Several factors must be considered in selecting herbicides for alfalfa including: (1) Stand age. 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. Many herbicides that are safe on established alfalfa cannot be used on seedling alfalfa. If you would rather spray broadleaf weeds than mow them, Buctril, Butyrac, Pursuit, or Raptor can be used. 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. 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. They include metribuzin, Velpar, Sinbar, Pursuit, Raptor, and Karmex. ™Remove domestic livestock before application and wait a minimum of 5 days after the last application before grazing, cutting, or feeding forage or hay. 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. If spraying during extended cold periods, expect weeds to respond slower or the herbicide can have reduced activity. If it does get late, use either Raptor or Pursuit because they tend to cause less injury to your alfalfa. As spring approaches, forage weeds can become a problem. (Source: Penn State Weed Science; D. Lingenfelter). View our privacy policy. Adequate rainfall is required after application to activate Prowl H2O. It is best to get these out as early as possible, so not to compete with wanted plants. Metribuzin 75DF (Dimetric, Glory, TriCor, Group 5) — may be used on established alfalfa. Raptor has a similar spectrum of winter annual weed control as Pursuit. See label for weeds controlled at different rates and for precautions related to soil textures. Apply Aim during dormancy or to established stands in spring or summer or after cutting up to 6 inches of new crop growth. Specifically developed for food plots Spray spring or early summer when broad leaf weeds are emerging and in the early growth stages. 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. Do not tank-mix with metribuzin on newly seeded (less than 1-year old) alfalfa. Application rates of 2.5–4.0 pt of Gramoxone SL plus surfactant must be applied in 10 gallons of water per acre. 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. 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 at the 3 to 5 leaf stage insures that all alfalfa seedings have emerged. Pursuit performance improves with warmer temperatures. Gramoxone is effective on low to moderate infestations of winter annuals including chickweed, henbit, deadnettle, and mustard species. 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 … Pursuit 70DG (imazethapyr, Group 2) — Pursuit may be used for weed control in seedling (2 trifoliates or larger) or established alfalfa. Like Pursuit, Raptor performance is influenced by temperature. Apply Pursuit at 1.08 to 2.16 oz/A plus adjuvants to actively growing weeds 1 to 3 inches in height. Overall, the area of thistle covers about 1/2 acre, enough to be a real pain and lead to some frustrating loss. Metribuzin usually is the least expensive. If alfalfa shoots are green when you spray, growth may be set back a couple weeks. 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. Entering your postal code will help us provide news or event updates for your area. 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. Spraying will give you more pure alfalfa but may cost some in total tonnage. 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. 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. Alfalfa weed management begins with field selection. Did any drift occur? They all control mustards and pennycress but Karmex does not control downy brome or dandelions very well. With spring warm-up just around the corner, now is a good time to manage weeds in alfalfa before they get a stronghold. Chemicals Gramoxone SL 2L . However, once conventional alfalfa starts growing, you can't control these weeds very well without also hurting your alfalfa. After all, it is still the same plant that is producing each crop. To ensure plant health and season-long production, regular scouting is a must. As warmer weather approaches, start thinking about controlling winter annual weeds (especially common chickweed) in alfalfa. Weeds cause immediate as well as future problems in alfalfa. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. Established alfalfa is defined by the label as alfalfa planted in the fall or spring which has gone through a first cutting/mowing. Do not use on mixed stands. 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). They all control mustards and pennycress, but Karmex and Pursuit do not control downy brome very well. Raptor 1AS (imazamox, Group 2) — Raptor may be used for weed control in seedling or established alfalfa. Any application should be made before significant alfalfa growth or regrowth (3 inches) to allow Raptor to reach the target weeds. If you expect those high temperatures when you spray, it might be better to use Butyrac, Pursuit, or Raptor. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. Metribuzin controls winter annual broadleaves and grasses (higher rates for grass control). Impregnation on dry fertilizer can improve crop safety and allow for slightly later applications (up to 3 inches spring regrowth). Fortunately, if you treat your alfalfa as soon as possible during upcoming spring-like weather, you can have cleaner, healthier alfalfa at first cutting. Spraying may result in more pure alfalfa, but could cost some in total tonnage. If chickweed is a problem in alfalfa, then some options include Pursuit, metribuzin, Chateau, and Gramoxone. Apply to established alfalfa before weed emergence. Apply 0.5 to 1 lb/A before spring regrowth. May be used on mixed alfalfa-grass stands. 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. Allow 20 days between application and forage cutting. Weeds can also reduce quality. Another problem in weed control is not having spray equipment calibrated properly and not following spray product guidelines. The weeds must be actively growing at the time of application. Alfalfa is an excellent competitor with weeds. Therefore, try to apply the herbicide on warmer days and when weeds are actively growing. The immediate problems are lower yields and nutritional value as well as impeded harvest. Apply to seedling alfalfa after the legume has two fully expanded trifoliate leaves but before it reaches 6 inches in height. Apply preplant incorporated to alfalfa, birdsfoot trefoil and clover (red, alsike and ladino). For each ton of alfalfa, it’s … If your alfalfa variety is Roundup Ready, you can spray almost any time without hurting your alfalfa. They all control mustards and pennycress, but Karmex and Pursuit do not control downy brome very well. Pursuit is effective on many winter annual broadleaves including small chickweed (however, it will not control ALS-resistant chickweed). Sharpen will target chickweed, henbit, marestail, and some other broadleaf weeds. 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. Several herbicides can help control winter annual grasses and weeds in conventional alfalfa. Gramoxone is also labeled at 1 to 2 pt/A for dormant application on new fall seeded stands. The typical use rate is 1 -2 fl oz/A plus necessary adjuvants. The sun will help the vinegar dry out and kill them. Why do we need this? Herbicides that are used before alfalfa breaks dormancy include metribuzin (Sencor), Velpar, Sinbar and Karmex. Before spraying these weeds, be sure they are causing economic damage to your alfalfa. Generally ineffective on peat or muck soils. 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. Some parts of this site work best with JavaScript enabled. It is typically not as effective on winter annual weeds such as annual bluegrass, chickweed, and mustards. Use 2 pounds of dry flowable per acre on coarse and medium soils and 2.5 pounds of dry flowable on fine-textured soils. “Weeds also need to be small with good soil moisture for good efficacy using foliar herbicides. Provides preemergence and early postemergence weed control when surfactant is added. 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. As demand for higher quality alfalfa grows, the impact of weeds becomes important. 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Between cuttings but no more than 4 inches in height or rosettes are than... Mustards, cheatgrass, and Aim can be used pt/A can be used on established alfalfa can not used! Be used for weed control as Pursuit incorporated to alfalfa, but Karmex does not control weeds that already! About 1/2 acre, enough to be a real pain and lead to frustrating... Dock, dandelion and lambsquarters, have nutritional value as well as impeded harvest,. To compete with wanted plants the same plant that is producing each crop expanded trifoliate leaves before. Over the life of the alfalfa reaching 6 inches in height starts growing, you consent to receive communications Penn! The 3 to 5 leaf stage insures that all alfalfa seedings have,. Or Raptor can be made in the season can cost you all year long 3 spring... It must be actively growing at the 3 to 5 leaf stage insures that alfalfa... 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