Spring is here and with it comes the emergence of weeds- especially problematic perennials like Canada thistle (Figure 1). Canada Thistle produces flowers from about June until August. Philosophy The staff at Thistle Scientific Ltd., are determined to offer and maintain the highest of standards in terms of customer care. Stinger). Below is some information about Canada thistle and methods to manage it. Scientific Name: Cirsium arvense (L.) Scop., Other Names: chardon des champs, Canadian thistle, Creeping thistle, Field thistle, chardon du Canada Family: Composite or Aster Family (Compositae) General Description: Perennial, reproducing by seed and by horizontal roots which produce new shoots, often forming dense patches. Scientific Name Cirsium arvense (L.) Scop. A second option is to use effective systemic herbicides. In Canada, C. arvense is classified as a primary noxious weed seed in the Weed Seeds Order 2005 which applies to Canada's Seeds Regulations.. , Crop tolerance and weed control ratings were conducted in the spring of 2012, and the Prepass herbicide by DOW AgroSciences was found to be most effective at controlling the species as a weed problem in alfalfa fields. It it also different from other native North American species given its large roots and multiple small flower heads on a branched stem, Its underground structure consists of four types, 1) long, thick, horizontal roots, 2) long, thick, vertical roots, 3) short, fine shoots, and 4) vertical, underground stems. Common Name(s): Canada Thistle Scientific Name: Cirsium arvense (L.) Scop. , The plant is beneficial for pollinators that rely on nectar. , GIven its adaptive nature, Cirsium arvense is one of the worst invasive weeds worldwide. Considered noxious under the BC Weed Control Act  The seeds are 4–5 mm long, with a feathery pappus which assists in wind dispersal. Avoid contact of either herbicide with the crop. Exclusion and sanitation: Avoid spreading thistle roots, shoots, and seeds by implements such as mowers between fields. Keep in mind two things: 1) many of these strategies will work for other weeds, and 2) management of perennial weeds often requires persistence and an integrated approach. Biological Control 67:350-360. Plants form a low-growing rosette in the spring prior to bolting in mid-to-late May. After pollination, it can be seen that fragrance emission decreases in C.arvense. Stems are 30–150 cm, slender green, and freely branched, smooth and glabrous (having no trichomes or glaucousness), mostly without spiny wings. It also was a top producer of nectar sugar in a 2016 study in Britain, with a second-place ranking due to a production per floral unit of (2609 +/- 239 μg). Canada Thistle Scientific Name: Cirsium arvense Weed Class: C Requirement: Control* Native To: Asia and Europe Toxicity: Not known to be *In Clark County, control of … Shoots can also arise from the lateral buds on the underground portion of regular shoots, particularly if the shoots are cut off through mowing or when stem segments are buried.. Using multiple mowings, one at bud stage and one targeted toward fall regrowth, will help deplete root energy reserves. Life Cycle. It is a non-native invasive species from Europe, and landowners with Canada thistle on their property are obligated to take measures to control it. The C3 plants originated during Mesozoic and Paleozoic eras, and tend to thrive in areas where sunlight intensity is moderate, temperatures are moderate, and ground water is plentiful. Native To:  It is a ruderal species. Scientific name: Cirsium arvense (L.) Scop. The taproot is considered the most nutritious part. 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