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Bull thistle (Cirsium vulgare) and Scotch thistle (Onopordum acanthium) are biennials, <br /> and can be treated the same as musk thistle. These weeds are also best controlled with <br /> Milestone at 5-7oz/acre, applied in late summer-early fail on first year rosettes or early in <br /> the season of the second year before rosettes bolt. <br /> Cheatgrass (Bromus tectorum) and Downy brome (Bromus secalinus) are highly invasive <br /> annual or winter annual grasses, and are the subject of considerable research on effective <br /> controls due to their impact on Great Basin rangelands. Aminocychlopyraclor as Matrix <br /> has been found to be effective when applied according to specific label directions. <br /> Roundup (glyphosate), Journey, Plateau, and Landmarke may also be effective when <br /> used according to label directions. Glyphosate at 10 oz. / acre will control cheatgrass <br /> without doing lasting damage to cool season perennial grasses more economically than <br /> other treatments. <br /> Tarweed (Madia glomerata) is a broadleaf annual. It can be controlled by either using <br /> Round-up, where grass loss can be tolerated, or disked before flowering. Because <br /> tarweed is an annual and prevention of seed production is the primary goal, an <br /> application of 2 qts/acre of 2,4-D 4 lb amine can effectively dessicate the weed and <br /> prevent seed maturity. Tarweed can be controlled with Escort at 3/4 oz per acre with a <br /> good surfactant. This weed will typically disappear once good grass cover is established. <br /> Common mullein (Verbascum Thapsus) is biennial C List noxious weed in Colorado <br /> most typically occurring on disturbed sites. if the plants are few in number a shovel is a <br /> great tool for control and loppers or pruners can be used to remove flower spikes before <br /> seed is mature. Herbicide is control is more difficult because of the extremely hairy <br /> surface. Good control can be achieved with Perspective at 5 oz. / acre applied in <br /> adequate water to thoroughly wet the leaf surface (30 gal. / acre). A crop oil surfactant <br /> works better than non-ionic surfactans to help penetrate the wooly leaf surface. Spraying <br /> should be done in the fall on first year rosettes or in spring just as the rosettes begin to <br /> bolt. <br /> Other Noxious Weeds not listed here: Glyphosate (Roundup) is often, but not always <br /> effective when treating individual plants or when loss of grass is not a problem. The <br /> Routt County Weed Supervisor will work with the permit holder to develop specific <br /> control measures needed to control any noxious weeds found in the future on this <br /> property but not described here. <br /> 6 <br />