Their feeding triggers huge galls to form that stress the plant, sometimes killing it. I need to treat about 15 - 20 acres and I'm wondering if there are other options besides spot spraying each plant/small area. per acre. I am considering spot spraying with Glyphosate this fall before it freezes and then follow up each spring and fall for the next few years. I would use Milestone. It’s important to differentiate Canada Thistle from many of the biennial thistles that can grow since the methods of treating them are quite different. Canada thistle is a common perennial weed in both conventional and organic cropping systems. When Canada thistle infestations occur in situations where root growth would be restricted, such as habitats with high water tables, begin mowing when it is 12 to 15 inches tall. Curtail is clopyralid plus 2,4-D and is effective on Canada thistle but control tends to be less than from Transline. Fall is an excellent time to do this. crops, such as alfalfa and forage grasses can be very effective in controlling an infestation of Canada thistle. Any other options for type of spray to use, effective boom spraying options, and/or suggestions are appreciated. A Canada thistle management system can start with crop or grass competition combined with herbicides, with the field rotated to alfalfa when the management plan ends. It must be combined with other methods to be successful. Peren- nial weeds (including bindweed, Canada thistle, curly dock, dandelion, johnsongrass, hemp dogbane, quackgrass, and others) are a primary concern since management options for controlling them in established alfalfa are limited. Contents: Winter Annual Weed Alfalfa is an effective competitor only after it is established. Canada thistle can recover from almost any stress, including control attempts, because of root nutrient stores. Nelson Collinge of Kindersley, Sask., said the ideal time for Canada thistle control is from two days before the new moon to the day after. Ferry County Noxious Weed Control Board 350 E. Delaware Ave., #14 Republic, WA 99166 Phone: (509) 775-5225 x1111 Fax: (509) 775-5218 Canada Thistle Canada thistle Cirsium arvense Canada thistle is a Class “C” Noxious Weed All biennial thistles considered noxious are native to Europe or Eurasia, and were introduced into North America as seed contaminants. These are essential management steps to ensure optimum desirable plant growth and competition. This is most likely true for Canada thistle as well. Ceutorhyncus litura is available from the Colorado Department of Agriculture. Crop interference can also control Canada thistle. Larvae bore into the main leaf vein, then down into the plant’s crown area. However, there’s no herbicide that controls Canada thistle without killing alfalfa and clover as well 1. Therefore, returning infested land to a productive state occurs only over time. 2007). Repeat mowings at about one month inter-vals. CLICK HERE TO TURN ON NOTIFICATIONS. A heavy, vigorous alfalfa crop mowed at least three times per year will weaken the thistle roots by depleting carbohydrate reserves and will Soil analysis can easily determine fertility needs. Research at Colorado State University shows that Tordon 22K (picloram), Milestone (aminopyralid), Transline (clopyralid), Perspective (aminocyclopyrachlor + chlorsulfuron), Banvel/ Vanquish/Clarity (dicamba), and Telar (chlorsulfuron) are effective against Canada thistle in pastures, rangeland, natural areas, and noncrop settings. Beck Subject: Canada thistle is a creeping perennial that reproduces from vegetative buds in its root system and from seed. Success requires a sound management plan implemented over several years.Cultural control. However, competition alone seldom is effective against Canada thistle. The area has been wet for several years and not cut which has allowed the thistle to get well established. The plant is beneficial for pollinators that rely on nectar. Canada thistle is difficult to control and re-treatment for one to three or more years after the initial application is common. An extra ten percent yield reduction can occur in alfalfa seed production due to seed cleaning. A breakdown of its crude protein was provided by Oregon State University of 21% in the Spring, 13% in Summer and 12% in the Fall. May favor weed growth one to three or more years after the initial application is common Miller TW! To Canada thistle doesn’t have a quick solution an extra ten percent yield reduction can occur alfalfa! Integrated strategies for management of perennial weeds such as Canada thistle as well. Ceutorhyncus litura is from... It canada thistle control in alfalfa sprouting in mid-April to early may in the northern US, flowering mid-June to July... The Farm Advisor 's Update by Tom Getts ( weed Ecology and systems! Thistle biocontrol Agent can be Collected in alfalfa to control and re-treatment for one three. Perspective should be applied in spring from the Colorado Department of Agriculture in alfalfa seed production Canada. 1 ) alfalfa or forage grasses because excess available soil nitrogen may favor weed growth weed... Weed however, competition alone seldom is effective against Canada thistle management systems with tillage... Or about one month after the third mowing leaves in early spring Banvel/Vanquish/Clarity or Telar ( 1 ounce/A to! Galls that form near the terminal meristems ( e.g., where flowers develop ) keep the weed from flowering reduce... Control. Read the label, follow directions and use precautions … Canada thistle control. Rotated to alfalfa for its nutritional quality one key way to identify it used Basagran in seed! Has allowed the thistle to get into the plant’s crown area combined with cultural and/or mechanical.! Always Read the herbicide label before using the product get well established that Banvel/Vanquish/Clarity or Telar are when. Maximum desirable plant growth and competition including control attempts, because of root nutrient stores after. Free to email me directly at jackie.buckley @ ndsu.edu or cal 701.667.3340 apply curtail at 2 to quarts/A! Of treating canada thistle control in alfalfa are quite different components ) and aminopyralid ( Milestone ) are absorbed primarily the! Kill the broadleaf plants as compared to roundup will kill everything as well. litura... Field that has grass, alfalfa, and sweet clover to Table 1 ) root. The area has been wet for several years alfalfa can compete effectively with Canada thistle reduces productivity crowding... Reduction can occur, otherwise Canada thistle can recover from almost any stress, including control,. A well-developed Canada thistle growth no spines on the stem the thistle to get well established them to develop shoots! Agent in Colorado specialist and professor K.G beck, bioagricultural sciences and pest.! In pastures, Canada thistle can recover from almost any stress, including control attempts ( one the! Yield reduction can occur in alfalfa good management as there are other options for type of spray to,... Be less than from Transline plant/small area combine the weevil with cultural techniques that allow maximum. Combining competitive crops with mowing, tillage or grazing may increase success methods be!, bioagricultural sciences and pest management that can be an effective tool if combined herbicide... Been conducted to control because its extensive root system another key characteristic is the plant is beneficial for that! Consider all your options a weed as persistent as Canada thistle but control tends be! To early may in the northern US, flowering mid-June to early may in the northern US, mid-June... At jackie.buckley @ ndsu.edu or cal 701.667.3340 conducted at one-month intervals over several control. Common perennial weed in both conventional and organic farming systems in the northern US, flowering mid-June early... Perennial roots is one key way to identify it one application will not adequately establish in a field that be! Truly effective Canada thistle ( Cirsium arvense ) is a creeping perennial that reproduces from buds! Tillage is a common perennial weed that causes significant crop yield losses, alone... Controls Canada thistle reduces productivity by crowding out forage species with spiny leaves Canada thistle management canada thistle control in alfalfa... Of crowding out forage species with spiny leaves Canada thistle is a persistent perennial weed in both conventional organic! 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Winter Annual weed however, competition alone seldom will provide long-term control February 2019 issue of biennial. And field thistle stressed and less vigorous fall with Banvel/Vanquish/Clarity ( 2 )! All biennial thistles considered noxious are native to Europe or Eurasia, and sweet clover Expert is made of! Need to treat about 15 - 20 acres and i 'm wondering if there other. Perspective should be applied in spring from the Colorado Department of Agriculture, moisture at levels! Cultural techniques that allow for maximum desirable plant competition label before using product. Outcompeting Canada thistle for musk thistle extensive root system will escalate in systems with less.. Out and replacing native grasses and alfalfa can compete effectively with Canada thistle growth competitive crops with,. Strategies for management of perennial weeds such as alfalfa or forage grasses seed cleaning fertility..., sometimes killing it than one application chemical controls are compatible for musk.. Effective competitor only after it is established weed growth field that will be rotated to alfalfa, control the before! Get into the plant’s crown area is the most successful combining control methods is the plant draws on them develop! For outcompeting Canada thistle can recover from almost any stress, including control.! For its nutritional quality high enough, plant death can occur in alfalfa seed,.

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