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c) Biological Control: No biological control techniques are currently <br />approved for I loundstongue. <br />d) Chemical Control: There are numerous herbicides labeled for use on <br />f-Ioundstongue. The selection of a herbicide depends on the area of <br />infestation. Some herbicides that can be used independently or in <br />combination according to EPA recommendations are picloram (Tordon <br />22K), dicamba (Banvel(+2,4-D)) or any other EPA approved chemicals. <br />Mayweed chamomile (Anthemis cotula): Mayweed chamomile is an annual that <br />reproduces by seed. <br />1. Control Measures <br />a) Cultural Control: Plant competition from various grasses can be a very <br />effective management tool. Revegetation with aggressive desirable <br />perennials in disturbed areas can assist in preventing an infestation. <br />b) Mechanical Control: Mechanical control can be accomplished by had <br />pulling small patches throughout the summer. This will prevent seed <br />production, but mowing may stimulate shoot density resulting in a <br />more dense stand than before. <br />c) Biological Control: No biological control techniques are currently <br />approved for Mayweed chamomile. <br />d} Chemical Control: There are numerous herbicides labeled for use on <br />chamomile. The selection of a herbicide depends on the -area of <br />infestation. Some herbicides that can be used independently or in <br />combination according to EPA recommendations are picloram (Tordon <br />22K) or any other EPA approved chemicals. <br />Musk thistle (Carduus nutans): Niusk thistle is a biennial that reproduces by seed. It <br />is a difficult plant to control because of its prolific seed production. <br />1. Control Measures <br />a) Cultural Control: Plant competition from various grasses can be a very <br />effective management tool. Revegetation with aggressive desirable <br />perennials in disturbed and riparian areas can assist in preventing an <br />infestation. <br />b) Mechanical Control: Mechanical control can be accomplished by <br />mowing before it reaches the flowering stage. Severing the roots below <br />the ground with a shovel is also effective on small infestations. <br />c) Biological Control: There are two species of weevils (Rhinocyllus <br />conicus and Trichosirocalus horridus) registered for use in Colorado. <br />They are normally available for use. <br />