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

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