Herbicides need to be applied before a killing freeze and when there is sufficient alfalfa growth (generally 4 to 6 inches). The restriction varies depending on the crop, rate, and product so read the label carefully. One step is to spray a grass selective herbicide if the grass competition is strong. To be most successful, though, you must apply these herbicides before alfalfa shoots green-up this spring to avoid much injury to your alfalfa. Often the combination of an herbicide application followed by tillage a week or more later provides the best control. Allow alfalfa to regrow until it has about 6 inches of new growth, then spray with 1 quart glyphosate plus 1 quart 2,4-D. Spray a second time if needed near the end of July. “Now we have Enlist, Liberty, and Xtend (herbicide-tolerant weed-management systems). Butyrac (2,4-DB) – Butyrac is a helper that can be added to one of the above herbicides to add a lot of burn on broadleaf weeds. Roundup PowerMAX ® Roundup PowerMAX herbicide provides the powerful weed control you’ve come to trust and expect from the Roundup ® brand glyphosate-only agricultural herbicide family. This is the broadleaf king slayer of herbicides. Crop safety is better than Buctril, but you should have at least two trifoliates on the alfalfa before you spray. We typically only recommend 1 to 2 ounces of Butyrac to minimize crop injury. Also safe on Chickory where Pursuit is not. Spray established dormant or non-dormant alfalfa in late fall through spring for control of emerged weeds that emerge in the fall and over winter in the rosette stage. Established alfalfa applications must be made when alfalfa is dormant, semidormant (less than 3 inches of regrowth) or between cuttings. Do not graze or cut for hay within 30 days after treatment. Ideally, temperatures for a few days following the application should be above 50°. The good news is that several options now exist for postemergence applications in soybeans,” says Bolte. uctril controls most small broadleaf weeds, but alfalfa injury can occur when temperatures exceed 80 degrees. Expected weed response for alfalfa herbicides can be found in Table 2 on page 4. About 30 percent of farmers use a combination of herbicides and tillage. Keystone Pest Solutions Pursuit Herbicide - 1 Gallon (Same as Slay Herbicide) [241-310] - Pursuit Herbicide (1 Gallon) -Compare to Slay Herbicide Replacement better product now available.. Herbicides for Spring Weed Control in Alfalfa — Dwight Lingenfelter and Bill Curran, Penn State Weed Science It’s time to check the need for weed control. “Make these postemergence applications for corn in … Various. Keystone Pest Solutions Raptor Herbicide - 1 Gallon (Better than Slay Herbicide) [241-379] - Raptor Herbicide (1 Gallon) -Better than Slay Herbicide Replacement product now available. if alfalfa has 6 trifoliate leaves. Lack of effective weed control during stand establishment can dramatically reduce alfalfa yield, and result in poor stands, regardless of seeding rate. Same active ingredient as Raptor, a better product than Pursuit, much lower price. Herbicide registrations increased through the 1980s. Will not control emerged weeds, only germinating weeds and nutsedge tubers. Herbicides are applied to 75% of newly planted alfalfa in California.2 Herbicides are considered an integral part of a total weed manage system that compliment cultural approaches. Herbicides in alfalfa. Imazethapyr (Pursuit) has both preemergence and postemergence activity and is selective in alfalfa. Same active ingredient, half price. Search Imox on our store. Clover, alfalfa and chicory are the perennials that you may plant in some of your green fields that will need to be mowed. The Herbicides . Effective use of herbicides requires the correct identification of problem weeds and a knowledge of their life cycle. Glyphosate is the logical choice in Roundup Ready corn following a non-Roundup Ready alfalfa crop, but other active ingredients are also available if both crops are glyphosate tolerant. “Pre-emergent herbicides are needed on established hay to kill hard to control weeds such as palmer amaranth,” Benyshek adds. Growers should select herbicides that will control the weed species that are present. Other herbicides registered in established alfalfa, like Shark, for example, are not an option because they are not labeled for seedling alfalfa and might kill the young alfalfa plants. Available in Quarts and Gallons. 2,4-D is safe for lawns since herbicides containing as the active ingredient control most broadleaf weeds without harming the grass. During mild winter weather would be a great time. Caution should be taken, however, before spraying 2,4-D weed killers on turfgrass. If you buy hay for your animals, ask the farmer or seller which herbicides, if any, were used in producing the hay. Rate/Acre Broadcast Currently, tillage is the most common method of removing forages from the rotation. Figure 1. Consult a copy of the herbicide label from a farmer or online. The other major question has been how to take out alfalfa stands, since many have used Roundup for this. Herbicides for Alfalfa and Other Legume Hay Crops* Herbicides recommended for use in alfalfa are listed in Table 1 on pages 3 and 4. During mild winter weather would be a great time. The specific herbicides and control strategies avail-able for use will depend on the type of forage you grow (alfalfa, alfalfa/grass mixture, clovers, or other legumes), whether your stand is a new seeding [prior to first cutting] or an established stand, and the crop growth stage (dormant, nondormant, be-tween cutting). Rate/Acre Broadcast “ Pre-emergent herbicides are labeled for use in pure—stand alfalfa – without grass. 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