If it does get late and alfalfa turns green before you can spray, switch your herbicide choice to either Pursuit or Raptor. History. The most critical time for weed management in alfalfa is during establishment. Leaf number and leaf content in alfalfa hay are direct indicators for digestibility, crude protein, and relative feed value (Kuehn et al. (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. In both newly seeded and established stands, to preserve the yield and quality potential of forage and hay, … Currently, the best herbicides for control of alfalfa include 2,4-D, dicamba (Banvel), and clopyralid (Stinger). Daughter tuber damage may occur at levels where mother crop symptoms are not visible. 1999. In corn with Roundup Ready® 2 Technology, Roundup® brand glyphosate-only agricultural herbicides can be applied broadcast up to the V8 growth stage or 30-inch tall corn, whichever comes first. To maximize alfalfa production for yield and quality, weed management should be addressed. Roundup Ready alfalfa incorporates genetic resistance to the herbicide glyphosate (Roundup, Touchdown, Glyphomax, etc.) 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. Alfalfa forage composition as affected by weeds can have significant impacts on protein content and overall feed quality (Cords 1973). Roundup Ready (RR) alfalfa is a popular weed management strategy for alfalfa producers in California and other western states, with the greatest advantages considered to be excellent weed control without crop injury. Roundup Ready Alfalfa has demonstrated it makes late summer seeding of alfalfa a great option. Although Roundup Ready alfalfa can be an excellent option for weed control in alfalfa, it may not be appropriate for all situations. JavaScript seems to be disabled in your browser. 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 necessary, the spring application should be made when weeds are actively growing but less than 4 inches tall. There tends to be a large amount of weed pressure in spring planted alfalfa, and Roundup is one of the best options for controlling them. Martin. By entering your email, you consent to receive communications from Penn State Extension. Roundup did and excellent job of controlling the different populations of weeds that occurred with the late plantings. Alfalfa is also used for greenchop and silage in many areas. Cords, H.P. There is little or no crop injury associated with glyphosate application and Roundup Ready alfalfa. In 1996, genetically modified Roundup Ready soybeans resistant to Roundup became commercially available, followed by Roundup Ready corn in 1998. For spring seedings in the Midwest, companion crops also … No other pre-emergent herbicides can be used on spring planted alfalfa, which is why it is important to utilize this Roundup Ready trait during spring planting. What you definitely want to check the alfalfa for is weevil activity. In the Northeast, alfalfa is often seeded with a grass in a mixed stand. See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement, 22 to 44 fl. In particular, alfalfa-grass mixtures and alfalfa seeded with companion or nurse crops are generally not suitable. Roundup Ready alfalfa should be seeded at typical rates while the seedbed may be prepared through tillage or if suitable, through no-till. And spray Roundup before weeds and alfalfa seedlings get more than about three inches tall. Spraying at the 3 to 5 leaf stage insures that all alfalfa seedings have emerged. In a small area that hadn’t been sprayed, alfalfa was 8–12 inches taller than where glyphosate had been applied. Of course, it makes sense to spray if you have weeds. On Farm Observations. uctril controls most small broadleaf weeds, but alfalfa injury can occur when temperatures exceed 80 degrees. Fields with perennial weed problems may also be good candidates. If weed problems persist, an additional application of glyphosate can be made up to 5 days prior to harvest. Planted the first time in Aug of 13 and the second time about May 5th. Exposure of the seed potato crop can cause germination failure or deformities. Did any drift occur? We also saw some benefit in 2011 to using roundup ready varieties when field conditions forced late plantings of the alfalfa. A second reason for glyphosate application at this time is to control the alfalfa "nulls." Some late summer seedings may require an additional herbicide application in the spring if weeds are present. Once herbicide-resistant weeds become established within a field, the herbicide becomes ineffective against those weeds that are resistant. Roundup Ready Alfalfa seed or crops (including hay and hay products) to China. 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. 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! Additional information on Roundup Ready crops is … Alfalfa (Medicago sativa) is an important perennial forage crop used around the world. Any comments with alfalfa or recurring weeds in clover would help. Current Roundup Ready crops include soy, maize (corn), canola, sugar beets, cotton and alfalfa, with wheat still under development. 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. When considering the value of this technology, the Royalty fee should be amortized over the life of the stand and the value of glyphosate herbicide should be compared to other competitive products. If your alfalfa variety is Roundup Ready, you can spray almost any time without hurting your alfalfa. Currently, there are no herbicides labeled for use in new alfalfa-grass seedings, so Roundup Ready alfalfa may be an option. Table compares the relative effectiveness of herbicides for control of Roundup Ready alfalfa. Weed Science 21:400-401. However, when glyphosate is applied to seedling alfalfa, the removal of the nulls has no impact on the future production of the stand. 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. First and most importantly, effective weed control should be implemented at this stage so that crop yield losses do not occur from weed competition. If the alfalfa isn’t a Roundup Ready variety, glyphosate can be applied 36 hours or longer before harvesting. Glyphosate resistance management should always be implemented when using glyphosate-resistant crops, such as Roundup Ready alfalfa. For production management, ask for the America’s Alfalfa Roundup Ready® Alfalfa Management Guide booklet. ROUNDUP READY ALFALFA - ESTABLISHED STANDS (NON-SEEDING YEAR) General Information PRODUCT INFORMATION Product Description: This product is a postemergence, systemic herbicide with no soil residual activity. When glyphosate is applied to susceptible plants, glyphosate blocks EPSP synthase preventing the production of essential amino acids and the plant dies. Thus, careful weed management during the establishment period of alfalfa is essential for maximum returns from an alfalfa crop over the life of the stand. Why do we need this? Progressive Cattle magazine captures the essence of the cattle producer and ranching experience. It is formulated as a water-soluble liquid … Roundup Ready alfalfa removal prior to crop rotation is similar to conventional alfalfa varieties. … Kuehn, C.S., H.G. Do not use dicamba prior to planting soybean or other susceptible crops. Alfalfa (Medicago sativa) is an important perennial forage crop used around the world. The portion that retained good snow cover last winter is now between knee and waist high and just starting to bloom. 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. 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). 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. The introduction of Roundup Ready alfalfa provides a new option for weed management in alfalfa. Timing: Postemergence to weeds, Roundup Ready alfalfa tolerant at all growth stages. Crop protection companies are suggesting how growers of the herbicide-tolerant alfalfa can manage the new crop’s weed control program. For perennial weed problems, glyphosate should be applied during early fall. Don’t wait too long, though. 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. It’s common to want to take a first cutting before killing an alfalfa stand and planting the field to a different crop. Greater than 95% control can be achieved with a combination of 2,4-D and dicamba without tillage when used prior to no-till corn. 1 Labeled for seedling alfalfa only.2 Select and Poast Plus also labeled for grass control in alfalfa. In no-till and reduced-till systems, apply a herbicide burndown application to control existing weeds at least 1 to 2 weeks before planting. In fact, over 95% of weed control in a healthy established alfalfa crop can be attributed to the alfalfa's competitive nature. Up to 10 percent non-tolerant seed may be present. The same thing occurred in several other fields that spring. The importance of this herbicide application is two-fold. Roundup Ready Alfalfa spraying - posted in Alfalfa/Hay: I have a field of RR alfalfa. Weed management in alfalfa is critical during stand establishment to ensure successful plant population. Evaluating alfalfa stands 30-40 days after planting is an eye opening experience for many. After the first harvest, and in subsequent years, glyphosate may be applied up to 5 days prior to harvest and when annual weeds are less than 4 inches tall. Glyphosate must be applied before any grass emergence and can not be used beyond establishment because of it's effectiveness on grasses. California is the leading producer of alfalfa hay in the United States, followed by Wisconsin, South Dakota, Minnesota, and Idaho. It also didn’t exhibit the yellowing and necrosis found in the sprayed area. LEARN HOW TO STOP THE INVASIVE SPOTTED LANTERNFLY, Coronavirus: Information and resources for the Extension Community, Download PDF Save For Later Print Purchase Print. The alfalfa crop will remain in the field for several growing seasons and will be harvested several times each season. Roundup Ready soybeans patent expired in 2014. It is generally non-selective and gives broad-spectrum control of many annual and perennial weeds, woody brush, trees and vines. 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. 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. Journal of Production Agriculture 5:349-352. Ratings were collected from trials conducted in Pennsylvania or neighboring states. Alfalfa was treated with 22 and 44 ounces of Roundup PowerMax per acre, and cold temperatures followed within a few days. Renz outlines several options for this scenario. 1992. 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). However, recent research and field observations have documented that injury is possible under certain conditions. Alfalfa seedlings establish slowly and are very sensitive to competition for limited resources. Early seedling management of Roundup Ready alfalfa is somewhat different than with regular alfalfa. Weeds and alfalfa hay quality. 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. In addition, successful weed seed production during alfalfa establishment will potentially increase weed seed reserves in the soil, contributing to future infestations. The 3 to 5 trifoliate stage recommendation applies to both spring and late summer seeded alfalfa crops. Vol is correct about weed control in Roundup Ready alfalfa using 22 oz. Journal of Production Agriculture 12:681-684. The sun will help the vinegar dry out and kill them. Deep tillage is also effective for removing established alfalfa stands. Compared to Scott Valley, alfalfa growth in Tulelake is delayed in the spring, and very late-spring frosts are more commonplace. 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. Results may differ with variation in weed size, temperature, rainfall, soil moisture, soil type, and soil pH. This is reported in the new “Weed Control in Alfalfa” publication highlighted in last months issue. If you take care of your part of this process, then the special seed coating plus excellent weed control with no crop injury that you get with Roundup, and a little cooperation from Mother Nature, will give you good stands from less seed. Alfalfa is the fourth largest crop grown in the United States behind corn, soybeans, and wheat. of Glyphosate/acre. 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. 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