The Sharpen label says to only apply 1 oz Sharpen PRE or 5 oz of Verdict (1 oz sharpen + 4 oz Outlook) PRE per acre on soybean. Unlikely. Residual preemergence applications of Sharpen must be activated by at least 1/2 inch of rainfall or sprinkler irrigation before weed seedling emergence. Any residual herbicide can be included with glyphosate and 2,4-D. Where nothing was applied the previous fall or early spring, there can be a need for a more aggressive burndown such as glyphosate+2,4-D+Sharpen, and this can limit the ability to use flumioxazin and sulfentrazone or force earlier application. It can also be used as a pre-emergent residual herbicide in maize and sweet corn crops. While Sharpen is a PPO and offers nice burndown, soybeans are very sensitive to Sharpen. The net result of this is large winter annual weeds, and weather that is currently not terribly conducive for burndown activity. Hasten at 1% v/v must be added when applying SHARPEN WG Herbicide with paraquat herbicides. A downside is residual burndown herbicides can have plantback restrictions. Activity of metribuzin varies considerably with soil texture and organic matter content, so using the labeled rate for soil type is important. .wp-show-posts-columns#wpsp-71721 {margin-left: -2em; }.wp-show-posts-columns#wpsp-71721 .wp-show-posts-inner {margin: 0 0 2em 2em; }December 8, 2020 — No change to the near-term forecast and only minor changes farther out this morning. Something to think about moving forward. Agricultural Employment Opportunities sponsored by, EPA provides clarification on Dicamba use, http://www.ocj.com/wp-content/uploads/2018/12/Web-Weather.mp3, More from Chief Meteorologist Ryan Martin. Apply only as a tank mix with recommendedrates of herbicide containing paraquat. Land Grant. The main benefit of Sharpen is that it will help control some emerged annual weeds that Roundup may be weaker on (e.g., wild buckwheat, volunteer RR canola, common mallow, etc.). It’s all just way easier. 4. Sharpen will help provide a clean start to the growing season. You must use a low rate of Sharpen because of this, which means there is not enough residual. Sequential applications of Sharpen® herbicide may be made within the dormant season as long as the maximum cumulative amount does not exceed 2.0 fl ozs/A of Sharpen. Research has also shown that Sharpen herbicide provides excellent residual control when applied at appropriate rates. It’s worth noting here also that the Xtend and Enlist soybean systems do away with the wait to plant soybeans for dicamba and 2,4-D, respectively, and more growers may be waiting until after planting to apply burndown/residual herbicides. 3. As with the less than effective residual herbicides under dry weather, burndown herbicide problems can sometimes be resolved with an effective POST treatment of glyphosate, 2,4-D, or dicamba, depending upon the trait system. Sharpen is three to five times faster than 2, 4-D ester and glyphosate and its residual activity can provide a wider, more effective window for postemergence herbicide applications. Remember, reduced residual control is not limited Group 15 herbicide resistance; resistance to soil-residual PPO-inhibiting herbicides also results in shortened residual control. On the other hand, Spartan would be expected to provide better season long weed control (assuming you are not cutting the rate). Many times I have been asked: “Should I use Sharpen or Spartan?” The point is that they are not an apple to apple comparison. These include products that contain metribuzin, sulfentrazone, flumioxazin, and chlorimuron. Spartan is used almost exclusively for its residual activity. Most growers are applying mixtures or premixes of several products, so we’re not sure these diiferences are as important as the overriding principle here. This varies with timing of application and weather. Fall-applied herbicides became a solution to this, since they result in almost weedfree spring seedbeds up until the point when giant ragweed and other summer annuals emerge (early May for most of these). When Sharpen is not activated, a labeled postemergence herbicide or cultivation may be needed to control weed escapes. So residual herbicides applied in mid-April, prior to most of the summer annual weed emergence, may not need rain as soon after application, compared with herbicides applied in May. There is benefit (i.e., fewer weeds) from the 2 fl oz rate, but it does not provide broad spectrum season long control. Authority Maxx herbicide offers premium performance and has the corner on value by providing economical residual control.  Â. On lighter soils and at higher rates there is a plant back In brief, symptoms of these are as follows: chlorimuron — slowed development, stunting, yellowing; flumioxazin and sulfentrazone — necrosis on young leaves and stem, stunting; metribuzin — usually delayed until first trifoliate, yellowing and possibly necrosis on margins of older leaves. Do not depend on Sharpen for residual control when applied at 0.75-1 fl oz. By Dusty Sonnenberg, CCA, Ohio Field Leader: a project of the Ohio Soybean Council and …, Your email address will not be published. If it looks like there will be a window of time between your burndown and planting, consider a burndown herbicide with residual activity like Sharpen, says Bolte. When used in tank mixture with a residual grass herbicide in maize crops SHARPEN will control fathen, black nightshade, broadleaf docks (seedling), willow weed and wireweed, and will suppress pink shamrock. As anyone knows who has used fall herbicides, their effectiveness reduces the overall importance of the spring-applied burndown, since it does not have to control a mess of large, overwintered weeds. The 4 oz of Spartan would provide better kochia control than 2 oz of Sharpen. The main point to emphasize it that Sharpen is mainly a burndown product.Â, Conversations at winter meetings and phone calls this spring have indicated that there is a misconception that Sharpen provides season-long residual, when it does not. Reichman Sales & Service PO Box 698 - Toluca, IL 61369 Phone: 815-452-2665 Fax: 815-452-2837 Their weed spectrum is different. The main benefit of Sharpen is that it will help control some emerged annual weeds that Roundup may be weaker on (e.g., wild buckwheat, volunteer RR canola, common mallow, etc.). So what is left to mix with Sharpen for residual marestail control if we cannot use flumioxazin or sulfentrazone products? We had a fairly warm winter and early spring, followed by the recent month of colder than normal weather. These examples do emphasize the necessity of applying full label-recommended rates instead of reduced rates, as reduced rates will further curtail the duration of residual control. So, if you tank mix Sharpen-containing products with another PPO/Group 14 residual herbicide you must wait 14 days to plant soybeans. Some information relative to questions that OSU Extension educators have passed on to us: 1. Sharpen is more of a burndown product while Spartan is not a burndown product, but is a soil residual product.Â. Short answer:  Don’t depend on it exclusively unless you’re applying the corn rate (and even in corn you probably won’t always rely on it exclusively). desired, Sharpen can be applied at 1.0 fl ozs/A (all soil types) with an adjuvant system any time before corn emergence to provide burndown of broadleaf weeds (refer to Table 1 in the product container label). Or if Sharpen is applied EPP in a burndown mix without the PPO residual product, then you must wait 2 weeks before applying the Group 14 residual herbicide at planting. Microbial degradation is very slow. Under more marginal rainfall conditions, it’s possible that herbicides may control the small-seeded weeds that emerge at or just below the soil surface, but be less effective on larger-seeded weeds that can emerge from deeper. Labels for products containing flumioxazin state that soybeans should be planted 1.5 inches deep and herbicide should be applied no later than three days after planting, in an attempt to avoid this situation (does not always work). Aside from this we could make a general recommendation to keep applying as long as night and day temperatures are at least 40 and 60 to 70, respectively, although this is still not ideal compared with day temperatures higher than 70 with sun. Several residual soybean herbicides can cause injury, depending upon when they are applied relative to planting, rainfall, soil type, seeding depth, etc. This site is available in the following languages: English. The most effective stategy based on our research would be to use metribuzin 75DF at 8 to 12 oz/A, or add some to premix products that … Residual herbicide treatments need to receive a half to one inch of rain within a week or so after tillage or an effective burndown treatment, to control weeds that can will start to emerge at that time. Residual herbicides do vary in the relative amounts of rain needed for “activation”, or adequate movement into the soil to reach germinating seeds. One contributor to this was the occasional reduced activity of spring-applied burndown herbicides in cool weather, which resulted in too slow death and dry down of weeds to prevent the problems the weeds caused. Do not depend on Sharpen for residual control when applied at 0.75-1 fl oz. Resistance Management SHARPEN contains a herbicide from the PPO (protoporphyrinogen-IX-oxidase) group, HRAC GROUP E HERBICIDE . The concerns here seem to be more about soybean herbicides, which may partly reflect the overall greater safety of residual corn herbicides. Long answer:  At 0.75-2 fl oz, Sharpen is used primarily as a burndown with Roundup for control of emerged weeds. It’s more difficult to define the weather conditions when herbicide should not be applied. Affected by pH. One way of dealing with this problem is to just wait for a return to warm, sunny weather before applying burndown herbicides. Broken down primarily by acid hydrolysis. Spartan provides much more residual activity than Sharpen. Sharpen is a broadleaf herbicide for use as a pre-plant burndown in seed bed preparation (eg pasture renovation), conservation tillage, non agricultural situations and apple and pear orchards. Sharpen is used almost exclusively for its foliar activity. Do you get so much more weed control from 2 fl oz compared to 1 fl oz that the extra cost is justified? Sharpen ® Herbicide Sharpen up your spray program all year round Sharpen ® is a powerful knockdown herbicide that can be used to replace or reinforce the effectiveness of glyphosate in different use patterns all year Your email address will not be published. Water solubility increases as pH increases. 3. It enables flexibility when applying postemergence applications because of its residual activity and it reduces selection pressure for glyphosate- and ALS-tolerant weed biotypes. 4. Even 2 fl oz is iffy. For as little as $6 worth of fall-applied herbicide. “Sharpen has some really good activity on larger-seeded broadleaf weeds, so when mixed with Zidua you get outstanding residual control of a broad array of grasses and broadleaf weeds Including Palmer amaranth and waterhemp to name just a few.” Mark Oostlander, herbicide technical market manager, works firsthand with Verdict. Fall herbicides are an essential tool for marestail management, but given our current situation of dense, big weeds in no-till fields and potential problems with burndown herbicide effectiveness, it’s worth reminding all of us why fall herbicides started being used in the first place. Required fields are marked *. Sharpen will also help delay weed resistance to Roundup. One night of frost followed by a warm sunny day may still allow for decent herbicide activity, if weeds appear sufficiently recovered from the frost. In wheat or peas, a POST product will almost always be required to control later emerging broadleaf weeds. Cold weather and burndown herbicides. Research Institution. Not leached, nor volatile, nor broken down by photodegradation. Sharpen is a broadleaf herbicide for use as a pre-plant burndown in seed bed preparation (eg pasture renovation), conservation tillage, non agricultural situations and apple and pear orchards. 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