So … Users should follow recropping recommendations very carefully to avoid damage to pulse crops and legume forages. It's tough, it's spiny, it's hairy, and it's taking over your yard. Creating an Herbicide Plan for Canada Thistle Canada thistle is especially tricky in part because it spreads through both seeds and root shoots. This allows for systemic herbicides like glyphosate to be translocated to the root system 2. Capable of producing 14 shoots per square metre, and a root system that extends for 20 feet, Canada thistle can reduce cereal yields by up to 38%* and significantly affect crop quality. Canada thistle (aka creeping thistle) is a determined weed if ever there was one. Prairies, barrens, savannas and glades are susceptible, particularly those sites that have been disturbed and are revertin… Tordon 22K + 2,4-D provided better control than Curtail (a combination product containing clopyralid and 2,4-D). Cereal yield and quality losses from Canada thistle. Weed control challenge. Herbicides are often the most flexible and affordable option for thistle control in pastures. This variety of thistle grows by spreading, giving it the nickname creeping thistle. Table 1. Homemade Herbicide Thistle—whether it's of the musk, tall or Canada variety—is a very difficult weed to eliminate from your lawn or garden once it has taken hold; a single musk thistle can generate 120,000 seeds from one flower, and can grow to six feet tall. Biennial thistles spread only by seed (achenes) that are produced in great number by all the noxious species, ran… Canada thistle and sow thistle deliver aggressive in-crop problems for many growers. Clopyralid is a plant hormone mimic (Group 4) that causes twisting symptoms. Glyphosate 4 or 2 4-D Amine are ideal herbicides for fighting thistle plants, as they are systematic and will kill the plant down to the root. Pre-emergents kill germinating seeds, while post-emergents kill growing weeds. The 20-percent concentration can do this in about 2 hours. Beck Subject: Canada thistle is a creeping perennial that reproduces from vegetative buds in its root system and from seed. Canada thistle spreads both by seeds and by budding from underground roots. However, this process will require A LOT of patience, diligence, and time. POSTEMERGENCE HERBICIDES FOR CONTROL OF BIENNIAL THISTLES. It is detrimental to natural areas communities where it occurs, particularly non-forested communities, and it can change the natural structure and species composition where it becomes well established. GrazonNext® HL, Milestone®, Chaparral®, Graslan® L, Stinger®, Overdrive®, and Tordon 22K® are all products that are labelled for use on biennial thistles as well as Canada thistle. Flowering Canada thistle. Biennial thistles, such as musk (Carduus nutans L.), plumeless (Carduus acanthoides L.) and bull thistle [Cirsium vulgare (Savi) Tenore], are not as difficult to control as the perennial thistle species, but spread rapidly and can become severe problems in some areas. Canada thistle has long been one of the most problematic weeds in Iowa and the northern corn belt. Applying Herbicide to Canada Thistle The timing for herbicide can vary between different types of weeds, as well as different CRP establishments. Clopyralid(Lontrel, Curtail M, Prestige XC, etc) is the active ingredient for many herbicide products with very good activity on Canada thistle and are suitable for use in wheat, barley, canola and flax. Canada thistle, one of the most tenacious weeds in the world, proved the most susceptible; the 5-percent concentration had a 100-percent kill rate of the perennial’s top growth. For effective control of Canada thistle, apply 16 to 20 fluid ounces per acre of DuraCor® herbicide after the first buds form in late spring. In practice, the rate may be considered quite high and could be scaled back, especially after the first year, because the big boost in forage production came in the first year. Best Selective: Pulverize Selective Weed Killer. For more information on Canada thistle treatment see these links: It was introduced to North America in the 1600s, probably in agricultural seed shipments and is now widespread throughout the United States and Canada. Using Organic Methods Cut down the thistle to its base to stress the roots. Spring and fall applications may be necessary for effective control. Life cycle: invasive* perennial broadleaf weed with deep root system Growth habit: clump-forming; grows to 2 - 5 ft. high; leaves long and narrow, alternate, irregularly lobed with spiny margins; spineless stem Thistle seedling Canada thistle infestation Canada thistle has small flowers and long triangular-shaped leaves with pointy tips on the end. Always read and follow the label when using any herbicide. Combining control methods is the best fo\ rm of Canada thistle management. Estimated Levels of Weed Control Normally Expected with Alfalfa Herbicidesa Broadleaf Weeds Grass Weeds Herbicide Canada Thistle Chickweed Dandelion Dock, Curly Field Pennycress Henbit Lambsquarters Mustard, Wild Nightshade, Black Pigweed Plantain Ragweed, Common Ragweed, Giant Shepherdspurse Smartweed Wild Radish Yellow Rocket Barnyardgrass Crabgrass Downy Bromegrass … And long triangular-shaped leaves with pointy tips on the end buds in its root system and from.! 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