With most annual weeds, though, you have a few options. For chemical options see the 2016 Alfalfa and Oilseeds Pest Management Guide. However, weed control usually improves protein percentage and palatability of harvested forage. Metribuzin usually is the least expensive. •Control weeds that emerge after cutting or in areas where the alfalfa stand is thin Herbicides for Established Alfalfa •Velpar + Gramoxone or Sencor + Gramoxone applied in February or early March before spring greenup are the best option for winter annual weeds in the Intermountain region Control of dandelion may not necessarily improve the quality of hay, but it may be of some value in reducing the time necessary to dry the hay, since dandelion dries more slowly than alfalfa. Use 2 pounds of dry flowable per acre on coarse and medium soils and 2.5 pounds of dry flowable on fine-textured soils. Selective post-emergent herbicides, such as bromoxynil, 2,4-DB, sethoxydim, clethodim, imazethapyr and imazamox can be used in conventional and Round-up Ready® alfalfa. The best thing you can do to get yo… Weed control in alfalfa fields must begin long before the stand starts to thin out. Controlling weeds. Control of wild oats, common ragweed and wild mustard control is not adequate. The use of glyphosate in Roundup Ready alfalfa has proven an effective means to control many difficult weeds without crop injury issues, although the spread of glyphosate resistant weeds, such as fleabane, may reduce the effectiveness of the technology for many growers. Tilling can often be used over an entire planting area on level ground, or in contour bands in erodible terrain. Once these weeds get a foothold, they can have a yield-limiting and negative quality effect in spring. Crop rotation allows the ability to target difficult to control species in crops that utilize more effective weed control practices, for example, broadleaf weed control in wheat. The second reason for controlling weeds is … Apply preplant incorporated to alfalfa, birdsfoot trefoil and clover (red, alsike and ladino). How to control weeds in my clover plot? Weed control has greatest value if there is a premium for high quality, pure legume forage. When the stand starts to reach the end of its useful life, or in the event of a disturbance in the field, dandelions and other weeds will move in. Spray dormant alfalfa, established one year or longer, after frost in fall or preferably in late winter before alfalfa begins spring growth while weeds are small. Also, do not smother small seedlings with clippings. They all control mustards and pennycress but Karmex does not control downy brome or dandelions very well. A stem density of 55 stems of alfalfa per square foot or higher indicates a high yielding field with a good stand and vigor. In the fall there are some chemicals that will give fair but not complete control. How to control weeds in my clover plot? Keep cost of fall herbicide treatments in the range of $4-12/acre. Tips for Controlling Dandelions in Your Field. Establishment of alfalfa (Medicago sativa L.) alone rather than with an oat (Avena sativa L.) companion crop usually results in a reduction in dry matter production.Use of herbicides for weed control during alfalfa seedling establishment also reduces yield since weeds are harvested along with the alfalfa and contribute to forage yield. Million dollar question right? Alfalfa and Dandelions By John McGregor, MFGA Extension Support At this time of year as we move closer to the first cut of alfalfa, dandelions can ruin the look of any hay field. The second reason for controlling weeds is to improve forage quality. Weed control: control alfalfa weeds in late summer and fall. A single moldboard plowing will kill alfalfa and most perennial grasses (quack grass may require a year of summer fallowing). Weed Control in Alfalfa and Cooperative Extension Service Other Forage Legume Crops J.D. The herbicides that are currently available can effectively control most weeds in established alfalfa without harming the crop, but removing weeds from a heavily infested, poor stand of alfalfa … Timely mowing can reduce the competi- tion and spread of many weeds in alfalfa. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa in the fall or in the spring. Alfalfa flowers are also important food for both wild and domesticated bees, contributing to the latter's production of honey, wax and other products. In grass pasture and hay fields, dandelions can be suppressed or controlled by 2,4-D, dicamba, dicamba + 2,4-D (tank mixture), Escort, Grazon, MCPA and Remedy. No preharvest interval (PHI) stated. Alfalfa is a vigorous crop that is very competitive with weeds. ™Add AMS at 8.5 to 17 lb/100 gallons of spray solution. 2,4-DB (Trade names Butoxone, Butyrac) alone or mixed with bromoxynil (Trade Name Buctril) are two herbicides that have shown promise in controlling small broadleaf weeds. Sethoxydim (Trade name Poast) may be used to control grass weeds. To control these weeds a post-emergence selective herbicide may be used. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. Glyphosate + 2 4-D (or dicamba) can be an initial low cost option to consider that provides control of a relatively broad spectrum of weeds. Several factors must be considered in selecting herbicides for alfalfa including: ... with the tops of the plants consistently similar to alfalfa. Several herbicides can help control winter annual grasses and weeds in alfalfa. Applying herbicides before new growth occurs is called a dormant application. Considerations for rotation should be made. The presence of dandelions can injure alfalfa seed crops and is often the main reason for removal or rotation of these perennial stands. Alfalfa and dandelions: Is there anything we can do? The best thing you can do to get yo… Greater than 95 percent of weed control in alfalfa is due to a healthy stand from competition. Alfalfa can be removed with herbicides and/or aggressive tillage. The most common herbicides used for control of many broadleaf weeds in grass hay/pasture this time of year are the plant growth regulator herbicides such as 2,4-D, dicamba (Banvel, Clarity, etc. Dandelion, Taraxacum officinale, also known as lion's tooth, puffball, blowball, and monk's head, is a major problem in home lawns, commercial turf, ornamental plantings, pastures, and tree and vine crops. Two grass herbicides are labeled for the postemergence control of sandbur in alfalfa. Application rates are based on rotation intervals of the alfalfa crop. Dandelions come close to equaling alfalfa in protein and total digestible nutrients (TDN). One dandelion alone can produce about 2,500 very mobile seeds per year 2, and they can significantly impact your grain and alfalfa yields if not managed correctly 3. Use 2 pounds of dry flowable per acre on coarse and medium soils and 2.5 pounds of dry flowable on fine-textured soils. ), triclopyr products (Crossbow, Garlon, etc. Winter annual weeds start developing in alfalfa fields in late summer and early fall. While tillage can result in > 80% mortality, tillage implement, operation of equipment as well and environmental conditions can dramatically affect control. Something else to consider is that controlling dandelions by spraying will not increase the forage yield by any significant amount. Dandelion Control in Perennial Forage:There are no herbicides available for control of dandelions in alfalfa. Any application should be made before significant alfalfa growth or regrowth (3 inches) to allow Raptor to reach the target weeds. Weeds may also be too big for effective herbicide control (generally they have to be 1 to 3 inches or less) and the alfalfa seedlings are too small for these herbicides (they have to be at least at second trifoliate leaf). As we move into the growing season, dandelions can cause many potential headaches not just in your lawn but also in your alfalfa field. Drying time may be reduced. Table 1A- Weed response to soil-applied herbicides in corn Vigorous weed growth this spring may make it extra tough for your seedlings as weeds reduce growth of new alfalfa by shading and competing for moisture. One is the weeds can become dense enough to compete against the alfalfa … 133 0 obj << /Linearized 1 /O 135 /H [ 1260 413 ] /L 132395 /E 43250 /N 7 /T 129616 >> endobj xref 133 41 0000000016 00000 n 0000001171 00000 n 0000001673 00000 n 0000001831 00000 n 0000002072 00000 n 0000002265 00000 n 0000002554 00000 n 0000002871 00000 n 0000003663 00000 n 0000004467 00000 n 0000004730 00000 n 0000005132 00000 n 0000005924 00000 n 0000006714 00000 n 0000009724 00000 n 0000010573 00000 n 0000011039 00000 n 0000015650 00000 n 0000017023 00000 n 0000023220 00000 n 0000027060 00000 n 0000027177 00000 n 0000027293 00000 n 0000027976 00000 n 0000029196 00000 n 0000029621 00000 n 0000037579 00000 n 0000037723 00000 n 0000038019 00000 n 0000038317 00000 n 0000038421 00000 n 0000038757 00000 n 0000039068 00000 n 0000041608 00000 n 0000041752 00000 n 0000042061 00000 n 0000042340 00000 n 0000042444 00000 n 0000042791 00000 n 0000001260 00000 n 0000001651 00000 n trailer << /Size 174 /Info 132 0 R /Root 134 0 R /Prev 129605 /ID[<5a52befb8ecd18bf666c1d0b6d90be9d><5a52befb8ecd18bf666c1d0b6d90be9d>] >> startxref 0 %%EOF 134 0 obj << /Type /Catalog /Pages 121 0 R /JT 131 0 R /Outlines 120 0 R >> endobj 172 0 obj << /S 185 /O 346 /Filter /FlateDecode /Length 173 0 R >> stream Is it time to rip up your alfalfa stand? Both preemergence and postemergence herbicides exist which effectively eliminate weed competition without harming young al-falfa seedlings. Alfalfa seedlings, freed from weed competition during their first few weeks of growth, will produce higher-yielding and longer-lived stands. Cultural control of weeds Cultivation Chemical control of weeds Herbicide formulation and additives Herbicide application Pesticides and the environment Restricted use pesticides Herbicide resistance in weeds Herbicide sites of action. Application to alfalfa with greater than 6 inches of regrowth may result in unacceptable crop injury. Adjust mowing height so several leaves remain on alfalfa seedlings after clipping to help your alfalfa seedlings regrow rapidly. Buctril also needs to be applied when temperatures are below 80ºF. Green and Travis Legleiter AGR-148 Introduction The importance of weed control in forage production should not be overlooked, especially when you consider the high invest-ment associated with alfalfa and other legume forages. Alfalfa is a vigorous crop that is very competitive with weeds. However, chemical weed control is often necessary even in well managed alfalfa since the marketplace has a low tolerance for weeds in alfalfa … A stem density of 50 stems of alfalfa per square foot or below indicates a low yielding field and a weaker stand. Dandelion Control in Perennial Forage:There are no herbicides available for control of dandelions in alfalfa. With the warm weather in the forecast, alfalfa may begin to grow. As we move into the growing season, dandelions can cause many potential headaches not just in your lawn but also in your alfalfa field. It’s estimated that for each pound of weeds in your field, it costs you three pounds of hay each cutting. Controlling weeds does not improve the legume stand and frequently does not increase total forage production. Considerations for rotation are not needed at this time. Herbicides that are used before alfalfa breaks dormancy include metribuzin (Sencor), Velpar, Sinbar, and Karmex. When weeds, especially broadleaf weeds, threaten seedling alfalfa, mowing is often used for control. There are numerous methods used to control weeds. Weeds can be controlled mechanically, with routine mowing at the appropriate time. H�b```f``y��d�b`@ Vv���>�Ĺ��Rd��10,��T�:`\��!�Өt�];jgP��++�6n.דژpr��@⡺����O��m�1q�;�A&ӑ.�+`0��� �+� F�@Z���"���6qO��:�0�3` k�օ%���S���^� �pPqb���:F��f[� ����M7���n`?%����C�-ׂ~���%��y��8mP9�>p�L#_�[L�2N�O��8�� �}k���_9@��&. Grasses also help prevent weed invasion by filling in spaces between alfalfa crowns. Dandelions come close to equaling alfalfa in protein and total digestible nutrients (TDN). Fortunately, it is confined almost always to sandy soils. Selective post-emergent herbicides, such as bromoxynil, 2,4-DB, sethoxydim, clethodim, imazethapyr and imazamox can be used in conventional and Round-up Ready® alfalfa. Is it time to rip up your alfalfa stand? A stem density of 50 stems of alfalfa per square foot or below indicates a low yielding field and a weaker stand. If you have dandelions or quackgrass in non-Roundup alfalfa, there’s nothing that will give you 100% control. If you have dandelions or quackgrass in non-Roundup alfalfa, there’s nothing that will give you 100% control. Spraying an herbicide prior to tillage is usually conducted as this combination greatly improves chances of alfalfa mortality. Alfalfa can be removed with herbicides and/or aggressive tillage. The presence of dandelions can injure alfalfa seed crops and is often the main reason for removal or rotation of these perennial stands. Controlling weeds There are three reasons for controlling weeds in alfalfa. Alfalfa's robust growth makes it an ideal cover crop, anchoring soil, retaining its moisture, helping it store carbon and controlling weeds. When weeds, especially broadleaf weeds, threaten seedling alfalfa, mowing is often used for control. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa in the fall or in the spring. Alfalfa requires high levels of fertility for establishment, especially phosphorus. Greater than 95 percent of weed control in alfalfa is due to a healthy stand from competition. Non-tolerant RR alfalfa Control Apply in the fall, in the spring to dormant or semi-dormant alfalfa, or between cuttings Has both foliar and soil activity Works best on small weeds Reasonably good control of broadleaf weeds, but grass control can be inconsistent Add surfacta nt and liquid N It is not cost-effective to control weeds in a thin or weak stand. Raptor, mainly a broadleaf herbicide with activity on some grasses, also has field sandbur on the label. Like Pursuit, Raptor performance is influenced by … “We suggest around flowering time, or seed head formation,” said Lingenfelter. Many weeds, although not all, have a lower feed value than alfalfa. A stem density of 50 stems of alfalfa per square foot or below indicates a low yielding field and a weaker stand. The presence of dandelions can often injure alfalfa seed crops and is often the main reason for removal or rotation of these perennial stands. Taraxacum officinale is found as a weed throughout California and T. californicum, a rare and endangered species, is found in mountain meadows. Roundup PowerMAX Canadian growers aren’t alone — dandelions are a nuisance for farmers worldwide 1. The herbicides that are currently available can effectively control most weeds in established alfalfa without harming the crop, but removing weeds from a heavily infested, poor stand of alfalfa … However, they can cause wet and moldy spots in hay bales when harvested and their presence is an indicator of a weak stand. Weeds affect alfalfa during two distinct periods: stand estab­ Table 1A- Weed response to soil-applied herbicides in corn Fargo, Tilling. There is no more critical time to control weeds in alfalfa. Considerations for rotation should be made. While it may not be worthwhile to control dandelions with an herbicide, stem density should be one major aspect to determine overall alfalfa production. If producers decide to spray, this option might remove them, but at the same time will leave open spaces in the field for future regrowth of other weeds. Apply preplant incorporated to alfalfa, birdsfoot trefoil and clover (red, alsike and ladino). 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