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Canada thistle <br /> Management and Chemical Control: <br /> The key principle to Canada thistle control is to stress the plant and force it to use stored root <br /> nutrients. Canada thistle can recover from almost any stress, including control attempts, because <br /> of its root nutrient stores. Successful management requires a management plan implemented over <br /> several years. <br /> Tordon 22K (picloram), Curtail (clopyralid plus 2, 4-D) are effective against Canada thistle <br /> when applied on non-crop areas like the Cash and Who Do Mines. In the spring, when Canada <br /> thistle is 10 to 15 inches tall, in one-bud to early bud growth stages, applications of curtail are <br /> most effective. Retreatment in the fall with Telar or Tordon for control is recommended. <br /> Manufacturers' recommended applications per acre will be followed according to the season. <br /> Common mullein <br /> Management and Chemical Control: <br /> Common mullein can be effectively controlled using any of several readily available general use <br /> herbicides such as glyphosate or triclopys. Applications can be made during the early spring. <br /> CMC will follow the label and manufacturer's recommendations for the most effective <br /> application. <br /> Downy brome <br /> Management and Chemical Control: <br /> There are several types of herbicides that can be used alone or combined to provide effective <br /> control of Downy brome. Herbicides should be applied in the early spring when non-target <br /> species are dormant to insure selective control. Downy brome is best controlled when the plants <br /> are 10 inches or less and growing vigorously at the time of application. Herbicides applied in the <br /> spring include quizalofop, fluazifop-p-butyl, sethoxydim, glyphosate, and imazapic. Fall <br /> herbicide applications generally use sulformeturon methyl and metribuzin. The manufacturer's <br /> recommended applications per acre will be followed according to the season. <br /> Spotted/Diffuse knapweed <br /> Management and Chemical Control: <br /> Spotted/diffuse knapweed is readily controlled with herbicides. Picloram is the most widely used <br /> recommended herbicide for knapweed. Other effective herbicides include Clopyralid, Dicamba, <br /> and Curtail. Herbicides should be applied before the mature plants set seed, or to rosettes in the <br /> fall, to maximize effectiveness. Areas where knapweed has been established need to be <br /> monitored two or three times a year (spring, summer, and fall) and any new rosettes should be <br /> destroyed. Diffuse and spotted knapweed can be managed similarly with the same herbicides. <br /> 2 <br />