spraying weeds in alfalfa

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

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