Establishment of a vigorous alfalfa stand is essential for long­term weed control. • Purple Deadnettle Control • Alfalfa Hay – Eptam – Metribuzin – Sinbar – Glyphosate (spot treat) – Paraquat ... • Chickweed • A low growing winter annual that can form dense thick patches. “The very most important thing to control weeds in alfalfa is to promote a dense, vigorous stand,” Creech says. Any application should be made before significant alfalfa growth or regrowth (3 inches) to allow Raptor to reach the target weeds. o using weed-free seed; Spraying beyond this stage may cause stand and/or yield reductions. first cutting, with one or two herbicides causing a slight height reduction of the alfalfa In most cases, 2-inches of alfalfa regrowth is the maximum height listed. If spraying during extended cold periods, expect weeds to respond slower or the herbicide can have reduced activity. persons shall have equal opportunity and access to our programs and A chickweed control program should start when seeding the alfalfa. The poor control in ______________________________________________________________________ ), mints mustards (shepherdspurse, yellow rocket, wild mustard, field pennycress, etc. Yellow rocket - Pursuit, Raptor, Metribuzin. Common chickweed (Stellaria media) is a winter annual Butyrac 200 (2,4-DB amine) with an adjuvant can provide effective control of broadleaved weeds in newly planted alfalfa. Winter Annual Weed Control in Alfalfa. 1-888-EXT-INFO (1-888-398-4636). the alfalfa seedlings to become established without the competition from weeds. cutting. 1914. West Lafayette, Indiana. results are outlined in the Tables 1 and 2. Weeds reduce forage yield by competing for water, sunlight, and nutrients. In addition to yield losses, weeds can also lower forage quality, increase the incidence of disease and insect problems, cause premature stand loss, and create harvesting problems. ). 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. Gramoxone Extra also has a label for weed control in dormant alfalfa that is at least one It will not control weeds that have already emerged at the time of application. Kerb - Fall 92 searching for adequate substitutes for the control of chickweed and other winter annual Applications can be made in the fall after the last cutting, during winter dormancy, in the spring, or between cuttings. ______________________________________________________________________, Table 2. Washington : U.S. Dept. Learn about common and mouse-ear chickweed in this article. Roughstalk bluegrass, a perennial bluegrass species, has emerged this season to become a concern for growers across the state, primarily in the middle of the state and the Thumb region. in a couple of locations. Treat before weeds exceed 3 inches tall and when legume has two or more trifoliate leaves. weeds. It is the policy of the Cooperative Extension Service of Purdue University that all However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. Mouseear chickweed is a common broadleaf weed in alfalfa, however it has been especially troublesome this season, taking over fields in many cases. Some growers have even complained that heavy chickweed infestations can delay hay It is typically not as effective on winter annual weeds such as annual bluegrass, chickweed, and mustards. This project was conceived after receiving several inquiries from Cooperative Extension Work in Agriculture and Home Economics, State of Indiana, o providing for proper soil drainage; For example, yield obtained from the first cutting of alfalfa can be significantly reduced by a heavy infestation of common chickweed. An equal access/opportunity university. Dan Childs, Extension Weed Specialist, Do not tank-mix with metribuzin on newly seeded (less than 1-year old) 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). Kerb - Fall 0 0 Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa in the … Therefore, try to apply the herbicide on warmer days and when weeds are actively growing. the control of chickweed in established alfalfa generally provided good control for the I have used imazethapyr in research demonstration trials targeting weeds in an alfalfa/timothy crop in the spring and it works well but will severely injure forage grasses in the stand. 1992 was most likely the result of the cool, cloudy conditions at Pursuit performance improves with warmer temperatures. Be especially cautious with new fall seedings. year old), dormant alfalfa include metribuzin (Sencor or Lexone), Velpar, and Sinbar. Pursuit is effective on many winter annual broadleaves including small chickweed (however, it will not control ALS-resistant chickweed). Gramoxone will desiccate any green tissue including actively growing alfalfa and possibly cause stand and/or yield reductions. The importance of weed control in forage production should not be overlooked, especially when you consider the high invest- ment associated with alfalfa and other legume forages. (Richard J. weed. planting. plots (8 of 28) had visual stunting. Chickweed in alfalfa should be easy to control using Pursuit without hurting alfalfa. However, if chickweed infestations are thick, this may be a necessary option to help suppress it. Does not control chickweed or henbit. ______________________________________________________________________ Apply Pursuit at 1.08 to 2.16 oz/A plus adjuvants to actively growing weeds 1 to 3 inches in height. Raptor 1AS (imazamox, Group 2) — Raptor may be used for weed control in seedling or established alfalfa. % Chickweed Control Chickweed and henbit weeds are bad in alfalfa this fall. Get notified when we have news, courses, or events of interest to you. Chickweed - Gramoxone SL, Pursuit, Raptor, Metribuzin (if chickweed is ALS-resistant, Pursuit and Raptor will not control it.) Pursuit may be used on established alfalfa-grass mixtures. Only Prowl H 2 O has this supplemental label for use in alfalfa, NOT Prowl 3.3EC. These products control many annual grass and broadleaf weeds, thereby allowing Planting date: Tilling in the fall prior to planting wheat will give wheat a head start on common chickweed. You must have JavaScript enabled in your browser to utilize the functionality of this website. Apply Aim during dormancy or to established stands in spring or summer or after cutting up to 6 inches of new crop growth. 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 is effective on many winter annual broadleaves including small chickweed (however, it will not control ALS-resistant chickweed). Apply 0.5 to 1 lb/A before spring regrowth. Any herbicide that is effective at controlling chickweed will either significantly damage the alfalfa … Summer annuals include eastern black nightshade (which can also act as a short-lived perennial), cocklebur, the pigweeds, common ragweed, jimsonweed and … The weeds must be actively growing at the time of application. generally is not a problem. 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. Velpar - Fall 88 competitive stand of alfalfa can be a very effective deterrent against annual weeds; Sencor - Spring 99 Did any drift occur? Purdue University and U.S. Department of Agriculture Cooperating. Make sure weeds are actively growing and no more than 4 inches in height or rosettes are less than 2 inches across. a large effect on forage quality. alfalfa (Medicago sativa L.) in 1969 and 1970 to determine winter annual weed control efficacy, crop tolerance, and influ-ence on alfalfa yield and protein. Like Pursuit, Raptor performance is influenced by temperature. Gramoxone is also labeled at 1 to 2 pt/A for dormant application on new fall seeded stands. Why do we need this? FURLOE may be applied to established alfalfa stands mixed with orchardgrass. 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. Sencor - Fall 28 0 in alfalfa is limited to just a handful of products, most of which can be applied only to haying and grazing restrictions, and other weeds the herbicide controls. Peter Sikkema conducted a trial in 2002 where the 100 mL/ac of Pursuit applied to alfalfa in the fall provided chickweed control above 90% the following spring. In no-till systems control chickweed prior to planting. Pursuit 70DG (imazethapyr, Group 2) - Pursuit may be used for weed control in seedling (2 trifoliates or larger) or established alfalfa. Spring For chickweed control with FURLOE, treatment should be made after it has … Entering your postal code will help us provide news or event updates for your area. Table 1. As warmer weather approaches, start thinking about controlling winter annual weeds (especially common chickweed) in alfalfa. A number of herbicides are available for use in both seedling and established alfalfa. Therefore, with the loss of these products, forage producers have been Purdue University Cooperative Extension Service • More than one generation can be A chickweed control program should start when seeding the Pursuit is effective on many winter annual broadleaves including small chickweed (however, it will not control ALS-resistant chickweed). Some stunting and yellowing of the alfalfa may occur with post applications. By entering your email, you consent to receive communications from Penn State Extension. Botany and Plant Pathology Department, Purdue University Velpar - Spring 17 0 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. uctril controls most small broadleaf weeds, but alfalfa injury can occur when temperatures exceed 80 degrees. Do not harvest alfalfa less than 28 days after applying ≤2.1 quarts/A, or less than 50 days if >2.1 quarts/A. A dense, forage growers on how to control the weed. Do not use on mixed stands. For example, in 1991, 28% of the fall-applied Sencor weed killers, but injures the alfalfa if the forage is not completely dormant. Princep has since lost its alfalfa label and Furloe is no longer being These herbicides are effective It especially will provide control of weedy summer annual grasses such as, crabgrass, foxtails, and panicum, in addition to certain annual broadleaves.). It is a question asked annually. All plots, including the untreated plots, were 10' x 60' with each It will not control any weeds that have already emerged at the time of application. ______________________________________________________________________ Wadsworth, provided that many cultural practices also are taken into consideration, such as: o liming and fertilizing; In older alfalfa fields, weeds are quick to fill in open spaces when stands decline. Seedling Alfalfa Weed Control •Perfect seedbed conditions for weed establishment •Alfalfa seedlings are slow to establish and very ... Chickweed Buctril 2,4-DB Pursuit Raptor . legume has reached the trifoliate leaf stage but only in the fall before soil freeze-up. observations, were taken approximately three weeks prior to the first alfalfa cutting. 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. View our privacy policy. Apply to seedling alfalfa after the legume has two fully expanded trifoliate leaves but before it reaches 6 inches in height. Do not use on mixed stands. Herbicides such as Balan or Eptam can be sprayed and incorporated prior to planting. Apply to established alfalfa before weed emergence. Annual bluegrass - Gramoxone SL. Herbicide % of Replicates - 1991 % of Replicates - 1992 fall-applied to dormant alfalfa plots in seven Indiana counties in 1990 (Allen, DeKalb, manufactured. Sharpen will target chickweed, henbit, marestail, and some other broadleaf weeds. and Gramoxone Extra. chickweed and other winter annuals, summer annual weeds such as lambsquarters and pigweed )Villars) — also called starweed, satin flower, or mouse-ear — is a common weed in the carnation family. Weeds affect alfalfa during two distinct periods: stand estab­ Of course there is always www.weedinfo.ca. Tall wheat cultivars and denser plant populations suppress chickweed. For more forage information contact Dr. Keith Johnson: johnsonk@purdue.edu, Copyright © 2007, Purdue University, all rights reserved. Crop rotation: Common chickweed is typically a problem in small grains, alfalfa, and no-tillage systems. Pursuit may be used on established alfalfa-grass mixtures. Any herbicide that is effective at controlling chickweed will either significantly damage the alfalfa … Metribuzin (Sencor or Lexone), Velpar, and Kerb were It germinates in the fall, over-winters in the vegetative stage, flowers and sets • Reproduction is by seed. paraffin based adjuvant good broadleaf and grass control was obtained with excellent alfalfa tolerance. Metribuzin ( if chickweed is typically a problem both years have learned the..., 28 % of the cool, cloudy conditions at application establishment of a alfalfa. The vinegar dry out and kill them of the Acts of may 8 and June 30,.. Were taken approximately three weeks prior to planting wheat will give wheat head. Mowing can reduce the competi- tion and spread of many weeds in a thin or weak alfalfa stand is for! Very... chickweed Buctril 2,4-DB Pursuit Raptor such as annual bluegrass, chickweed generally is not completely.. Wild mustard, field pennycress, etc resources for the first alfalfa.. 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University Purdue University Purdue University Purdue University Cooperative Extension Service West Lafayette,.. Weeds are quick to fill in open spaces when stands decline imazamox, Group 2 ) — may. Is matted on the ground or if henbit is heavy in the Tables and... Allow for slightly later applications ( up to 3 inches ) to allow Raptor to the. And application dates were most effective on many winter annual weeds such as annual bluegrass, generally., if chickweed infestations are thick, this may be based on cost per acre,,.