Why do we need this? Gramoxone is also labeled at 1 to 2 pt/A for dormant application on new fall seeded stands. Can be easily applied with a 4-wheeler or tractor sprayer Raptor 1AS (imazamox) — Raptor may be used for weed control in seedling or established 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. Some parts of this site work best with JavaScript enabled. A number of herbicides are available for use in both seedling and established 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. ™Add AMS at 8.5 to 17 lb/100 gallons of spray solution. Herbicides that are used before alfalfa breaks dormancy include metribuzin (Sencor), Velpar, Sinbar and Karmex. Spraying beyond this stage may cause stand and/or yield reductions. Fortunately, if you treat your alfalfa as soon as possible during upcoming spring-like weather, you can have cleaner, healthier alfalfa at first cutting. There is no better weed control method than a dense stand of alfalfa. tion and spread of many weeds in 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. Overall, the area of thistle covers about 1/2 acre, enough to be a real pain and lead to some frustrating loss. Raptor 1AS (imazamox, Group 2) — Raptor may be used for weed control in seedling or established alfalfa. ™Timing: Postemergence to weeds, Roundup Ready alfalfa tolerant at all growth stages. Gramoxone is effective on low to moderate infestations of winter annuals including chickweed, henbit, deadnettle, and mustard species. With spring warm-up just around the corner, now is a good time to manage weeds in alfalfa before they get a stronghold. Several herbicides can help control winter annual grasses and weeds in conventional alfalfa. If spraying during extended cold periods, expect weeds to respond slower or the herbicide can have reduced activity. Slay is the field-tested selective broadleaf-weed herbicide that controls a wide spectrum of broadleaf weeds in clover and alfalfa fields. Any application should be made before significant alfalfa growth or regrowth (3 inches) to allow Raptor to reach the target weeds. In older alfalfa fields, weeds … With alfalfa, you get the chance for multiple harvests each year. See label for weeds controlled at different rates and for precautions related to soil textures. 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. In addition, spraying early eliminates the small percentage of Roundup Ready Alfalfa seedlings that are not actually Roundup resistant (around 5%). Provides preemergence and early postemergence weed control when surfactant is added. Do not use on mixed stands. Apply Pursuit at 1.08 to 2.16 oz/A plus adjuvants to actively growing weeds 1 to 3 inches in height. It especially will provide control of weedy summer annual grasses such as, crabgrass, foxtails, and panicum, in addition to certain annual broadleaves.). They all control mustards and pennycress, but Karmex and Pursuit do not control downy brome very well. Spraying Roundup Ready Alfalfa Did you plant Roundup Ready alfalfa this spring. Raptor has a similar spectrum of winter annual weed control as Pursuit. Most growers have an effective program to control winter annual weeds with a dormant season herbicide application. Application rates of 2.5–4.0 pt of Gramoxone SL plus surfactant must be applied in 10 gallons of water per acre. Like Pursuit, Raptor performance is influenced by temperature. Buctril controls most small broadleaf weeds fairly inexpensively, but alfalfa injury can occur when temperatures exceed 80°F. 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 performance improves with warmer temperatures. 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. Communications Bldg.Lincoln, NE 68583-0918. Pursuit 70DG (imazethapyr, Group 2) — Pursuit may be used for weed control in seedling (2 trifoliates or larger) or established alfalfa. Do not tank-mix with metribuzin on newly seeded (less than 1-year old) alfalfa. Specifically developed for food plots Spray spring or early summer when broad leaf weeds are emerging and in the early growth stages. Gramoxone is also labeled at 1 to 2... Raptor 1AS . Pursuit may be used on established alfalfa-grass mixtures. Did any drift occur? 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. 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. Apply Aim during dormancy or to established stands in spring or summer or after cutting up to 6 inches of new crop growth. 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). If chickweed is a problem in alfalfa, then some options include Pursuit, metribuzin, Chateau, and Gramoxone. 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. Spraying will give you more pure alfalfa but may cost some in total tonnage. 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. 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 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. Establishment of a vigorous alfalfa stand is essential for long­term weed control. No preharvest interval (PHI) stated. Get notified when we have news, courses, or events of interest to you. 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 label states it must be applied 28 days before harvest. Make sure weeds are actively growing and no more than 4 inches in height or rosettes are less than 2 inches across. Chemicals Gramoxone SL 2L . JavaScript seems to be disabled in your browser. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. Therefore, try to apply the herbicide on warmer days and when weeds are actively growing. Use 2 pounds of dry flowable per acre on coarse and medium soils and 2.5 pounds of dry flowable on fine-textured soils. Non-tolerant RR alfalfa Control Timing is crucial when controlling winter annual weeds before alfalfa starts to green up. Allow 20 days between application and forage cutting. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. “Weeds also need to be small with good soil moisture for good efficacy using foliar herbicides. 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. Alfalfa weed management begins with field selection. However, once conventional alfalfa starts growing, you can't control these weeds very well without also hurting your alfalfa. 1 pt/A can be applied between cuttings but no more than 5 days after harvest and before 2" of regrowth. As demand for higher quality alfalfa grows, the impact of weeds becomes important. Pursuit may be used on established alfalfa-grass mixtures. 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. If your alfalfa variety is Roundup Ready, you can spray almost any time without hurting your alfalfa. It should not be used in alfalfa/grass mixes. 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. 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). By entering your email, you consent to receive communications from Penn State Extension. 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. It is typically not as effective on winter annual weeds such as annual bluegrass, chickweed, and mustards. As warmer weather approaches, start thinking about controlling winter annual weeds (especially common chickweed) in alfalfa. Many herbicides that are safe on established alfalfa cannot be used on seedling alfalfa. (Prowl H2O is now labeled for use in cool-season grass forages (hay or pasture) either in pure-stand or mixed with 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! 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. (2) Weed identification. Do not use on mixed stands. Spraying will give you more pure alfalfa but may cost some in total tonnage. Several herbicides can help control winter annual grasses and weeds in conventional 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. Take advantage of the nice weather when it occurs. ™Remove domestic livestock before application and wait a minimum of 5 days after the last application before grazing, cutting, or feeding forage or hay. If alfalfa shoots are green when you spray, growth may be set back a couple weeks. It will not control any weeds that have already emerged at the time of application. weeds can be to alfalfa. Be especially cautious with new fall seedings. The immediate problems are lower yields and nutritional value as well as impeded harvest. The tough part is mistakes early in the season can cost you all year long. The sun will help the vinegar dry out and kill them. After all, it is still the same plant that is producing each crop. (Source: Penn State Weed Science; D. Lingenfelter). Progressive Cattle magazine captures the essence of the cattle producer and ranching experience. They all control mustards and pennycress but Karmex does not control downy brome or dandelions very well. 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