Current Status. Canadathistle is a noxious weed under Missouri law. As such, all landowners are required to control the plant if it is growing on their property. Tillage — Canadathistle shows varying effects from tillage. Shallow tilling does little to controlCanadathistle. In fact, shallow tilling (2.5-4 inches) actually could increase thistle density. millions in cost for control. Canadathistle is found in cultivated fields, meadows, pastures, waste places, roadsides, and prairies. Invasive Species–Best Control Practices–CanadaThistle. Page 4. Read the entire pesticide label before use. CanadaThistle and its Control. Canadathistle ( Cirsium arvense ) is a persistent perennial weed that causes significant crop yield losses. It reproduces through both seed and root... Biological control. Ceutorhyncus litura is a weevil currently used as a biocontrol agent in Colorado. The female lays eggs on the underneath side of Canadathistle leaves in early spring. An excellent opportunity to controlCanadathistle is during pasture renovation. Apply glyphosate at 2 qt/A and wait 7 to 10 days before any primary tillage. Canadathistle spreads quickly. It is difficult to control.Canadathistle will dominate an area if not controlled. Its prickly leaves and stems limit human activity where it grows. There are several reasons that thistles are difficult to control, including thousands of viable seeds per plant (Fig. 1), rhizomatous growth characteristics (Canadathistle) (Fig. There are few options for controllingCanadathistle in row crop ground. One can rogue it, but one has to be sure to pull up the entire root or it will regrow.
