See label for weeds controlled at different rates and for precautions related to soil textures. Pursuit may be used on established alfalfa-grass mixtures. If spraying during extended cold periods, expect weeds to respond slower or the herbicide can have reduced activity. However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. Apply 0.5 to 1 lb/A before spring regrowth. Can be easily applied with a 4-wheeler or tractor sprayer 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. JavaScript seems to be disabled in your browser. They all control mustards and pennycress, but Karmex and Pursuit do not control downy brome very well. Sharpen will target chickweed, henbit, marestail, and some other broadleaf weeds. 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. It will not control weeds that have already emerged at the time of application. Chemicals Gramoxone SL 2L . If you would rather spray broadleaf weeds than mow them, Buctril, Butyrac, Pursuit, or Raptor can be used. Why do we need this? 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. 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. Do not tank-mix with metribuzin on newly seeded (less than 1-year old) alfalfa. With alfalfa, you get the chance for multiple harvests each year. Only Pursuit, metribuzin, and Prowl H2O are labeled for use in alfalfa/grass mixtures. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. tion and spread of many weeds in alfalfa. 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. Take advantage of the nice weather when it occurs. Herbicides that are used before alfalfa breaks dormancy include metribuzin (Sencor), Velpar, Sinbar and Karmex. Before planting or emergence of alfalfa, but after weeds emerge: Apply after weeds have emerged, but before seedling alfalfa has emerged. (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. 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. Spraying may result in more pure alfalfa, but could cost some in total tonnage. Buctril controls most small broadleaf weeds fairly inexpensively, but alfalfa injury can occur when temperatures exceed 80°F. 1 pt/A can be applied between cuttings but no more than 5 days after harvest and before 2" of regrowth. 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. Applications can be made in the fall after the last cutting, during winter dormancy, in the spring, or between cuttings. Careful Before spraying these weeds, be sure they are causing economic damage to your alfalfa. You must have JavaScript enabled in your browser to utilize the functionality of this website. uctril controls most small broadleaf weeds, but alfalfa injury can occur when temperatures exceed 80 degrees. Use 2 pounds of dry flowable per acre on coarse and medium soils and 2.5 pounds of dry flowable on fine-textured soils. Seed Cost. Chemicals are best used to spot-treat concentrations of weeds rather than for spraying the entire grazing area. Brian & Darren give recommendations for weed control in alfalfa. However, once conventional alfalfa starts growing, you can't control these weeds very well without also hurting your alfalfa. If it does get late, use either Raptor or Pursuit because they tend to cause less injury to your alfalfa. If alfalfa shoots are green when you spray, growth may be set back a couple weeks. Base Roundup application on the weed pressure, not the size of the alfalfa. Alfalfa weed management begins with field selection. Alfalfa is an excellent competitor with weeds. Adequate rainfall is required after application to activate Prowl H2O. Apply Pursuit at 1.08 to 2.16 oz/A plus adjuvants to actively growing weeds 1 to 3 inches in height. 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 typical use rate is 1 -2 fl oz/A plus necessary adjuvants. Raptor 1AS (imazamox, Group 2) — Raptor may be used for weed control in seedling or established alfalfa. After all, it is still the same plant that is producing each crop. May be used on mixed alfalfa-grass stands. Like Pursuit, Raptor performance is influenced by temperature. View our privacy policy. Generally ineffective on peat or muck soils. Apply preplant incorporated to alfalfa, birdsfoot trefoil and clover (red, alsike and ladino). Weeds cause immediate as well as future problems in alfalfa. Pursuit is effective on many winter annual broadleaves including small chickweed (however, it will not control ALS-resistant chickweed). Fortunately, if you treat your alfalfa as soon as possible during upcoming spring-like weather, you can have cleaner, healthier alfalfa at first cutting. ™Add AMS at 8.5 to 17 lb/100 gallons of spray solution. 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. It should not be used in alfalfa/grass mixes. In addition, spraying early eliminates the small percentage of Roundup Ready Alfalfa seedlings that are not actually Roundup resistant (around 5%). They include metribuzin, Velpar, Sinbar, Pursuit, Raptor, and Karmex. 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. They lower yields, reduce quality, lessen palatability, and slow hay drydown. By entering your email, you consent to receive communications from Penn State Extension. Raptor 1AS (imazamox) — Raptor may be used for weed control in seedling or established alfalfa. Allow 20 days between application and forage cutting. Future problems resulting from the large amount of weed seed produced in weedy alfalfa fields include increased weed populations, decreased stand life, Several herbicides can help control winter annual grasses and weeds in alfalfa. Alfalfa Weeds Pasture Weed Control Weed control is best accomplished by maintaining a healthy pasture, mowing, proper drainage, and avoiding soil compaction. 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 spring approaches, forage weeds can become a problem. 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 is crucial when controlling winter annual weeds before alfalfa starts to green up. with alfalfa for water, nutrients, and light. Sure-K and Pro-Germinator liquid fertilizer products after each cutting. The weeds must be actively growing at the time of application. Higher rates can potentially cause a reduction in grass stand. It is typically not as effective on winter annual weeds such as annual bluegrass, chickweed, and mustards. Several herbicides can help control winter annual grasses and weeds in conventional alfalfa. Do not use on mixed stands. 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. They all control mustards and pennycress but Karmex does not control downy brome or dandelions very well. Specifically developed for food plots Spray spring or early summer when broad leaf weeds are emerging and in the early growth stages. Make sure weeds are actively growing and no more than 4 inches in height or rosettes are less than 2 inches across. Most growers have an effective program to control winter annual weeds with a dormant season herbicide application. In older alfalfa fields, weeds … Application rates of 2.5–4.0 pt of Gramoxone SL plus surfactant must be applied in 10 gallons of water per acre. Entering your email, you consent to receive communications from Penn State weed Science ; Lingenfelter. 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