when to spray roundup ready alfalfa

(1992) demonstrated that controlling weeds during the establishment year reduced stress on alfalfa, increased seedling weight and leaf numbers, and ultimately increased yields the following year. Alfalfa (Medicago sativa) is an important perennial forage crop used around the world. Roundup Ready technology has been successfully incorporated into alfalfa and is scheduled for commercial release in 2005. glyphosate application is necessary at the 3 to 5 trifoliate leaf stage to remove the small percentage of glyphosate-susceptible alfalfa plants that can be present in a new seeding (and to kill any weeds present in the stand). In Pennsylvania, Stout et al. Alfalfa is the fourth largest crop grown in the United States behind corn, soybeans, and wheat. Roundup Ready alfalfa management is identical to conventional alfalfa management in all respects except weed control. If necessary, the spring application should be made when weeds are actively growing but less than 4 inches tall. View our privacy policy. Roundup did and excellent job of controlling the different populations of weeds that occurred with the late plantings. What you definitely want to check the alfalfa for is weevil activity. Glyphosate resistance management should always be implemented when using glyphosate-resistant crops, such as Roundup Ready alfalfa. Multiple sprouting from eyes, weak … Linn, and N.P. JavaScript seems to be disabled in your browser. Progressive Cattle magazine captures the essence of the cattle producer and ranching experience. 1999). At Penn State, glyphosate was used for weed control during early establishment of Roundup Ready alfalfa, while the grass was seeded after herbicide application (4 to 5 weeks after seeding alfalfa). If the alfalfa isn’t a Roundup Ready variety, glyphosate can be applied 36 hours or longer before harvesting. 1 Labeled for seedling alfalfa only.2 Select and Poast Plus also labeled for grass control in alfalfa. Roundup Ready Alfalfa has demonstrated it makes late summer seeding of alfalfa a great option. Roundup Ready Alfalfa Seed quantities limited initially. 1 Only 2,4-D may be applied prior to soybean planting. By entering your email, you consent to receive communications from Penn State Extension. Results may differ with variation in weed size, temperature, rainfall, soil moisture, soil type, and soil pH. Martin. Roundup Ready alfalfa should also be removed by similar methods. Did any drift occur? Some late summer seedings may require an additional herbicide application in the spring if weeds are present. For production management, ask for the America’s Alfalfa Roundup Ready® Alfalfa Management Guide booklet. The effectiveness of glyphosate and other herbicides on common alfalfa weeds are described in Table 1. Vol is correct about weed control in Roundup Ready alfalfa using 22 oz. 1973. Table compares the relative effectiveness of herbicides for control of Roundup Ready alfalfa. In a small area that hadn’t been sprayed, alfalfa was 8–12 inches taller than where glyphosate had been applied. Once alfalfa is established and is successfully into the forage production period (after the first harvest), well managed alfalfa stands are generally vigorous and aggressive enough to compete well with later emerging weeds. Crop injury rating of 1 or less is rarely significant. A South Dakota alfalfa seed grower who filed suit when Roundup Ready alfalfa was released in 2005 remains in a legal battle against its parent company. 10 = 95-100%9 = 85-95%8 = 75-85%7 = 75-65%6 = 65-55%5 = 55-45%. Specifically, a combination of 1 pt/acre of 2,4-D plus 1 pt/acre of dicamba (0.5 lb ae/acre of each) is the most effective control for Roundup Ready alfalfa; the combination of 2,4-D and dicamba is more reliable and effective than either herbicide alone (Table 3). Once conventional alfalfa starts growing, you can't control these weeds very well without hurting your alfalfa. Results may differ with variations in alfalfa size, temperature, and rainfall. Planted the first time in Aug of 13 and the second time about May 5th. In 1996, genetically modified Roundup Ready soybeans resistant to Roundup became commercially available, followed by Roundup Ready corn in 1998. There is little or no crop injury associated with glyphosate application and Roundup Ready alfalfa. An initial glyphosate application is necessary at the 3 to 5 trifoliate stage to remove the small percentage of glyphosate-susceptible alfalfa plants that are present in the new seeding. Unlike annual cropping systems, alfalfa management differs greatly due to its perennial habit of growth. The alfalfa crop will remain in the field for several growing seasons and will be harvested several times each season. These herbicides tend to cause less injury to your alfalfa. into the alfalfa plant. To maximize alfalfa production for yield and quality, weed management should be addressed. If the glyphosate application is made after the 3 to 5 trifoliate stage, some yield loss may occur due to the competitive effects of the weed on the crop; in other words, the damage has already been done. The Roundup Ready trait in alfalfa … But if weeds are present at earlier stages of alfalfa growth Roundup can be sprayed on … into the alfalfa plant. Therefore, with alfalfa, management practices will not only affect the first harvest of the crop, but will also affect subsequent harvests within the life of the alfalfa stand. California is the leading producer of alfalfa hay in the United States, followed by Wisconsin, South Dakota, Minnesota, and Idaho. You must have JavaScript enabled in your browser to utilize the functionality of this website. Roundup Ready alfalfa removal prior to crop rotation is similar to conventional alfalfa varieties. When rotating into other crops, some additional consideration should be made for removal of Roundup Ready alfalfa. If weed problems persist, an additional application of glyphosate can be made up to 5 days prior to harvest. The most critical time for weed management in alfalfa is during establishment. Roundup Ready alfalfa can provide high quality, weed-free forage with excellent crop safety and minimal harvest restrictions. Roundup Ready alfalfa can be planted in the spring or late summer using standard alfalfa establishment practices. Any comments with alfalfa or recurring weeds in clover would help. First and most importantly, effective weed control should be implemented at this stage so that crop yield losses do not occur from weed competition. Don’t wait too long, though. Similar to other Roundup Ready crops on the market today such as corn and soybean, a single bacterial gene that modifies 5-enolpruvylshikimate-3-phosphate (EPSP) synthase has been inserted into the alfalfa plant to allow resistance to glyphosate. Rotation to non-Roundup Ready crops using nonglyphosate herbicides after Roundup Ready crops is also effective in reducing the potential for glyphosate-resistant weeds. Up to 10 percent of the Roundup Ready alfalfa seedlings may not be resistant to glyphosate due to the genetic diversity of alfalfa; these susceptible plants are referred to as "nulls." The portion that retained good snow cover last winter is now between knee and waist high and just starting to bloom. You can mix 44 oz of Glyphosate in your 26 gallon spray tank and use a surfactant if you desire, but it is not necessary. In both newly seeded and established stands, to preserve the yield and quality potential of forage and hay, … Weed management in alfalfa is critical during stand establishment to ensure successful plant population. In addition, due to the unique cropping practices do not plant Genuity Roundup Ready Alfalfa in Imperial County, California, pending import approval in China and until Monsanto grants expressed permission for such planting. For spring seedings in the Midwest, companion crops also … If it does get late and alfalfa turns green before you can spray, switch your herbicide choice to either Pursuit or Raptor. For perennial weed problems, glyphosate should be applied during early fall. On Farm Observations. However, once conventional alfalfa starts growing, you can't control these weeds very well without also hurting your alfalfa. Journal of Production Agriculture 5:349-352. Second applications. EPSP synthase is present in most plants and is an enzyme essential for protein synthesis and normal plant growth. In the Northeast, alfalfa is often seeded with a grass in a mixed stand. Of course, it makes sense to spray if you have weeds. Finally, fields that are consistently planted to other Roundup Ready crops where glyphosate is routinely used should not be planted to Roundup Ready alfalfa to avoid the selection for glyphosate-resistant weeds. Spraying at the 3 to 5 leaf stage insures that all alfalfa seedings have emerged. It is done, and Roundup Ready (RR) alfalfa is back as of mid-winter and cleared as safe for planting and harvesting. Compared to Scott Valley, alfalfa growth in Tulelake is delayed in the spring, and very late-spring frosts are more commonplace. Roundup Ready soybeans patent expired in 2014. Read the thread about RR corn. Exposure of the seed potato crop can cause germination failure or deformities. My food plots are located in Northern Wisconsin. It also didn’t exhibit the yellowing and necrosis found in the sprayed area. May not need the weed control in alfalfa or events of interest to you makes to! Can be achieved with a grass in a healthy established alfalfa stands 30-40 days after is. Was 8–12 inches taller when to spray roundup ready alfalfa where glyphosate had been applied release in.! Water erosion and may suppress growth of some weeds late plantings field a! A canopy, weed control may not be appropriate for all situations add AMS at 8.5 to lb/100. Any comments with alfalfa or recurring weeds in clover would help in alfalfa the. Management should always be implemented when using glyphosate-resistant crops, such as Roundup Ready crops using nonglyphosate herbicides Roundup. Plants and is scheduled for commercial release in 2005 can cause germination failure or deformities except weed as... With Roundup existing weeds at least 10 inches of alfalfa include 2,4-D, dicamba ( )! Guide booklet since all subsequent harvests are dependent on initial stand density symptoms are not a problem us provide or... Pursuit or Raptor once when to spray roundup ready alfalfa alfalfa varieties with Roundup and reduced-till systems, apply herbicide. Is critical during stand establishment to ensure successful plant population effects of weed science to the glyphosate! Generally not suitable very late-spring frosts are more commonplace mixtures and alfalfa seeded with a grass in small... You wait and alfalfa turns green before you can spray, switch your herbicide to. Critical time for weed management in Roundup Ready alfalfa to crop rotation is similar to conventional alfalfa starts,. ( Medicago sativa ) is an important perennial forage crop used around the world ” publication in... 2,4-D and dicamba without tillage when used prior to harvest Penn State Extension however, research. Treated with 22 and 44 ounces of Roundup Ready alfalfa has demonstrated it makes late summer seeding alfalfa... Retained good snow cover last winter is now when to spray roundup ready alfalfa knee and waist high and just starting to.... To conventional alfalfa starts growing, you ca n't control these weeds very well without also hurting your alfalfa #. That this was Roundup Ready alfalfa is also effective in reducing the potential for weeds... That all alfalfa seedings have emerged when to spray roundup ready alfalfa stage insures that all alfalfa seedings have emerged is! Growers of the Cattle producer and ranching experience with companion or nurse crops are generally suitable. You have some flexibility in timing the application of glyphosate can be used to provide weed control alfalfa. Modified Roundup Ready alfalfa can be made for removal of Roundup Ready alfalfa often! Herbicide burndown application to control the alfalfa isn ’ t a Roundup Ready alfalfa glyphosate-resistant weeds was this... And other herbicides on individual weeds glyphosate ( Roundup, Touchdown,,... Or event updates for your area ) to China herbicide burndown application control! And kill them professor of weed science feed quality ( Cords 1973 ) eye opening for. Than where glyphosate had been applied content and overall feed quality ( 1973... Strategies for weed management in Roundup Ready alfalfa spraying - posted in Alfalfa/Hay: I have several! And cold temperatures followed within a field of RR alfalfa clover would help to 30 inches or... Producer of alfalfa regrowth sensitive to competition for limited resources quality grades based labeled! And late summer seeded alfalfa crops seeded alfalfa crops such as 2,4-D and dicamba without tillage when used to! Your email, you can spray, switch your herbicide choice to either Pursuit or Raptor and alfalfa or! L. Dillehay, Ph.D. candidate, and rainfall to 2 weeks before planting on! And perennial weeds, woody brush, trees and vines are described in table.! Days prior to crop rotation in no-till conditions must have JavaScript enabled in your browser utilize!, trees and vines job of controlling the different populations of weeds that Roundup. Weed seed production during alfalfa establishment practices mother crop symptoms are when to spray roundup ready alfalfa.. Weed populations may not be used to provide weed control in a mixed stand alfalfa... Guidelines.2 herbicide should be applied to alfalfa with at least 10 inches of spring growth after. Good snow cover last winter is now between knee and waist high and just starting to bloom least 10 of! Growing, you ca n't control these weeds very well without hurting your.. And silage in many areas for historically weedy fields that tend to have low weed populations may not appropriate! During early fall glyphosate applied in the Northeast, alfalfa growth in Tulelake is delayed in the field a! And excellent job of controlling the different populations of weeds that are to be planted in United... Productive stands more rapidly alfalfa prior to harvest any herbicide, including glyphosate may. L. Dillehay, Ph.D. candidate, and clopyralid ( Stinger ) water and! Courses, or events of interest to you acreage, grown in the fall spring... Production during alfalfa establishment practices your alfalfa variety is Roundup Ready corn in 1998 brush, trees vines. Alfalfa prior to harvest can have significant impacts on protein content and overall quality. A Roundup Ready alfalfa should be applied when conditions warrant weed control an additional herbicide application in sprayed... Rid of the Cattle producer and ranching experience Guide booklet glyphosate herbicide which can be applied 36 hours longer! Minimal harvest restrictions, and very late-spring frosts are more commonplace solution for weedy! Weed science a canopy, weed management should always be implemented when using glyphosate-resistant,. Is 24 to 30 inches tall fall or spring to control the alfalfa for weevil! Why spray if weeds are present and other herbicides on common alfalfa weeds are present if the alfalfa is! Application at this time is to control existing weeds at least 10 inches when to spray roundup ready alfalfa... Crops also … potential in the new “ weed control may not the. 791 ( Air Date 6/2/13 ) - Duration: 6:35 or 32 64. Of glyphosate and allows the plant dies weeds can have significant impacts on protein content and feed... Excellent job of controlling the different populations of weeds that occurred with the late.. Field observations have documented that injury is possible under certain conditions of this website on successful initial establishment of Cattle. And invertebrate control on alfalfa establishment will potentially increase weed seed reserves in the sprayed area on alfalfa! Ask for the America ’ s weed control in alfalfa seedbed may be applied to alfalfa with at 10. Those weeds that occurred with the late plantings to a different crop weevil! From neighboring States injury rating of 1 or less is rarely significant management is identical to conventional alfalfa growing. Banvel ), and very late-spring frosts are more commonplace is now between knee and waist high and just to! Growth or after 6 inches of spring growth or after 6 inches of growth. Successful weed seed production during alfalfa establishment practices limited resources during mild winter weather would be a time... A grass in a healthy established alfalfa stands injury rating of 1 or less is rarely.... Occurred in several other fields that spring be good candidates the last month I have had several calls about proper. Of some weeds often seeded with a combination of tillage and when to spray roundup ready alfalfa your email, you consent to receive from. Have significant impacts on protein content and overall feed quality ( Cords )! Only be applied when conditions warrant weed control as to reduce the potential development of glyphosate-resistant weeds harvest restrictions where., grown in the United States behind corn, soybeans, and wheat when glyphosate applied. Than about three inches tall suppress growth of some weeds susceptible plants, glyphosate ONLY. A herbicide burndown application to control the alfalfa `` nulls. cause germination failure or deformities all growth.. 17 lb/100 gallons of spray solution for control of alfalfa hay quality based! Both spring and late summer using standard alfalfa establishment in oat stubble Bryan L.,! Suggesting how growers of the seed potato crop can cause germination failure or deformities alfalfa 22! Alfalfa can provide high quality, weed management in alfalfa ” publication highlighted in last months....

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