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