Evaluating alfalfa stands 30-40 days after planting is an eye opening experience for many. Effects of weed and invertebrate control on alfalfa establishment in oat stubble. Prepared by Bryan L. Dillehay, Ph.D. candidate, and William S. Curran, professor of weed science. And spray Roundup before weeds and alfalfa seedlings get more than about three inches tall. Applying glyphosate prior to the 3 to 5 trifoliate stage may be too early for effective weed control since many of the weeds have not emerged by this time (depending on seeding date). 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. ... Making Your Alfalfa Better #791 (Air Date 6/2/13) - Duration: 6:35. Stout, W.L., R.A. Byers, K.T. First and most importantly, effective weed control should be implemented at this stage so that crop yield losses do not occur from weed competition. 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. potential in the following years. It is formulated as a water-soluble liquid … Currently, the best herbicides for control of alfalfa include 2,4-D, dicamba (Banvel), and clopyralid (Stinger). 10 = 95-100%9 = 85-95%8 = 75-85%7 = 75-65%6 = 65-55%5 = 55-45%. Cords, H.P. into the alfalfa plant. Repeated applications of any herbicide, including glyphosate, may result in herbicide-resistant weeds. Roundup Ready alfalfa should also be removed by similar methods. Roundup Ready alfalfa is resistant to glyphosate herbicide which can be used to provide weed control. Spray Weeds Early with Roundup Ready Alfalfa By Bruce Anderson Extension Forage Specialist University of Nebraska–Lincoln If you planted Roundup Ready® alfalfa this spring, it may be time for that first herbicide application. The effectiveness of glyphosate and other herbicides on common alfalfa weeds are described in Table 1. Early seedling management of Roundup Ready alfalfa is somewhat different than with regular alfalfa. Crop injury rating of 1 or less is rarely significant. Growth regulator herbicides such as 2,4-D and dicamba are the most common herbicides for removing alfalfa prior to crop rotation in no-till conditions. Second applications. There is little or no crop injury associated with glyphosate application and Roundup Ready alfalfa. Jeff Jackson, Winfield's Forage and Corn Silage Specialist, shows the difference between a new seeding of RR Alfalfa compared to conventional alfalfa. Linn, and N.P. Glyphosate, of course, is not effective in the control of Roundup Ready alfalfa; however, glyphosate alone is also not an effective means for control of conventional alfalfa. Preliminary research has shown that it is possible to attain good weed control in mixed alfalfa-grass stands using glyphosate and Roundup Ready alfalfa, but strict management guidelines must be followed. If weed problems persist, an additional application of glyphosate can be made up to 5 days prior to harvest. Like other Roundup Ready crops, a Technology Use Agreement will be necessary as well as a "Line Item Technology Royalty Fee" in addition to the cost of the seed. 1992. This year I was thinking of planting them in roundup ready alfalfa figuring I could atleast spray roundup over the summer to keep the broad leaf weeds and grass down, and then maybe go back to clover in a year or two. Roundup Ready alfalfa incorporates genetic resistance to the herbicide glyphosate (Roundup, Touchdown, Glyphomax, etc.) Roundup did and excellent job of controlling the different populations of weeds that occurred with the late plantings. It states “the initial. The alfalfa crop will remain in the field for several growing seasons and will be harvested several times each season. Glyphosate must be applied before any grass emergence and can not be used beyond establishment because of it's effectiveness on grasses. This publication reviews 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. Many farmers are talking and asking about it, says an agronomist for Croplan Genetics, which is one of the companies that has RR alfalfa available. Renz outlines several options for this scenario. Preliminary results indicate that the alfalfa stand is increased, while weed density is reduced in Roundup Ready alfalfa/grass mixtures and that these effects may persist into the life of the stand. Fortunately, if you treat your alfalfa as soon as possible during upcoming spring-like weather, you can have cleaner, healthier alfalfa at first cutting. That's all there is to it. Roundup Ready Alfalfa Seed quantities limited initially. The most critical time for weed management in alfalfa is during establishment. When I replanted, I went through most of the entire field. The 3 to 5 trifoliate stage recommendation applies to both spring and late summer seeded alfalfa crops. oz 3S formulations, Remove livestock before application and wait a minimum of 5 days after application before grazing, or cutting and feeding forage or hay, After the first cutting, apply up to 5 days prior to harvest. Rotation to non-Roundup Ready crops using nonglyphosate herbicides after Roundup Ready crops is also effective in reducing the potential for glyphosate-resistant weeds. 1973. The rest is about 6 inches tall. for Roundup Ready® Alfalfa Seed Production IntRoductIon The genetic supplier members (hereinafter called the “Companies”) of National Alfalfa & Forage Alliance (NAFA) have agreed to jointly adopt, as a minimum, the following Best Management Practices for Roundup Ready Alfalfa (RRA) Seed Production in the United States. Ratings are based on labeled application rates and weed size or growth stage. In addition, successful weed seed production during alfalfa establishment will potentially increase weed seed reserves in the soil, contributing to future infestations. To maximize the benefits of Roundup Ready alfalfa, glyphosate should be applied to seedling alfalfa at the 3 to 5 trifoliate stage when weeds are less than 4 inches tall. Roundup Ready Alfalfa spraying - posted in Alfalfa/Hay: I have a field of RR alfalfa. Alfalfa is also used for greenchop and silage in many areas. Of course, it makes sense to spray if you have weeds. … In particular, alfalfa-grass mixtures and alfalfa seeded with companion or nurse crops are generally not suitable. 1999). If the alfalfa isn’t a Roundup Ready variety, glyphosate can be applied 36 hours or longer before harvesting. Alfalfa (Medicago sativa) is an important perennial forage crop used around the world. The label states to apply 22 to 44 ounces per acre when newly seeded alfalfa is at or before the third to fourth trifoliate stage to avoid gaps due to stand loss of susceptible alfalfa once plants are larger. Why do we need this? Table compares the relative effectiveness of herbicides on individual weeds. Did any drift occur? Measures to reduce the potential of developing glyphosate-resistant weeds can include crop rotation, herbicide rotation, proper herbicide rate, proper herbicide timing, and alternative weed control methods such as tillage and mowing. Chuck Noble of Winner, S.D., said that a Washington, DC, district appeals court ruled on June 10, 2013, that, while concerns exist, a lawsuit opposing the use of the Monsanto product isn’t warranted. 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 fact, over 95% of weed control in a healthy established alfalfa crop can be attributed to the alfalfa's competitive nature. Weed Science 21:400-401. 1999. 1 Labeled for seedling alfalfa only.2 Select and Poast Plus also labeled for grass control in alfalfa. Weed competition during establishment will reduce alfalfa seedling vigor and potentially reduce the alfalfa plant population, which can affect crop yield and quality throughout the life of the stand. If weed problems persist, an additional application of glyphosate can be made up to 5 days prior to harvest. EPSP synthase is present in most plants and is an enzyme essential for protein synthesis and normal plant growth. If weeds get more than 3 inches tall or alfalfa begins to form a canopy, weed control may not be as effective. Roundup Ready alfalfa should be seeded at typical rates while the seedbed may be prepared through tillage or if suitable, through no-till. Glyphosate resistance management should always be implemented when using glyphosate-resistant crops, such as Roundup Ready alfalfa. Read the thread about RR corn. If an appropriate glyphosate application is not made early in the life of the alfalfa stand, such as the recommended 3 to 5 trifoliate application, later applications will control the susceptible nulls leaving gaps or holes in the canopy of the alfalfa. By: Keef. 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. of Glyphosate/acre. If your alfalfa variety is Roundup Ready, you can spray almost any time without hurting your alfalfa. The perplexing part of the situation was that this was Roundup Ready alfalfa. But if weeds are present at earlier stages of alfalfa growth Roundup can be sprayed on … oz Roundup Weathermax 4.5S or 32 to 64 fl. If necessary, the spring application should be made when weeds are actively growing but less than 4 inches tall. Yield longevity of an alfalfa stand depends on successful initial establishment of the crop since all subsequent harvests are dependent on initial stand density. Deep tillage is also effective for removing established alfalfa stands. Exposure of the seed potato crop can cause germination failure or deformities. The importance of this herbicide application is two-fold. 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. Spraying at the 3 to 5 leaf stage insures that all alfalfa seedings have emerged. Follow label guidelines.2 Herbicide should be applied to alfalfa with at least 10 inches of spring growth or after 6 inches of alfalfa regrowth. This is reported in the new “Weed Control in Alfalfa” publication highlighted in last months issue. Timing: Postemergence to weeds, Roundup Ready alfalfa tolerant at all growth stages. Additional information on Roundup Ready crops is … Roundup Ready® (GENRR) alfalfa, which enables growers to apply glyphosate agricultural herbicides up to 5 days before cutting for unsurpassed weed control with excellent crop safety. With the broadest application timing window plus excellent crop safety, Roundup Ready Alfalfa requires minimal waiting — only 5 days before grazing or harvest. If you wait and alfalfa shoots are green when you spray, your alfalfa growth might be set back a couple weeks. Roundup Ready alfalfa management is identical to conventional alfalfa management in all respects except weed control. Once conventional alfalfa starts growing, you can't control these weeds very well without hurting your alfalfa. Progressive Cattle magazine captures the essence of the cattle producer and ranching experience. It also didn’t exhibit the yellowing and necrosis found in the sprayed area. Any comments with alfalfa or recurring weeds in clover would help. 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, recent research and field observations have documented that injury is possible under certain conditions. Jung, J.G. Characteristics of alfalfa hay quality grades based on the relative feed value index. Alfalfa is often controlled by a combination of tillage and herbicide. Roundup Ready alfalfa can provide high quality, weed-free forage with excellent crop safety and minimal harvest restrictions. If your alfalfa is a Roundup Ready variety, you have some flexibility in timing the application of Roundup. If they are at a threshold level, you may want to tank mix an insecticide with the Glyphosate to kill the weevil and have two or … Get notified when we have news, courses, or events of interest to you. Kuehn, C.S., H.G. 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