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6.2.2 Diffuse Knapweed <br />6.2.2.1 Mechanical <br />Mechanical control of diffuse knapweed includes multiple mowings of plants prior to the bud <br />stage during the growing season. This will prevent the plant from going to seed, thus eliminating <br />further plants from growing. <br />6.2.2.2 Chemical <br />Chemical control of diffuse knapweed includes application of herbicides containing picloram, <br />aminopuralid, clopyralid, clopyralid + 2,4- dichloropenoxyacetic acid (2,4 -D), or dicamba, or <br />combinations of the above. Application timing depends on the herbicide used. <br />6.2.2.3 Biological <br />Biological control includes use of livestock (sheep, goats, cattle) or insects to consume the <br />plants. For the Carma Bayshore site, livestock is not considered a viable option. Insects <br />including the seedhead fly Urophora affinis and Urophora quadrifasciata have been used in <br />many Front Range counties and cause the plants to produce fewer viable seeds and abort <br />terminal or lateral flowers. Root - feeding insects such as the diffuse knapweed root beetle <br />(Sphenoptera jugoslavica) feeds on the roots of diffuse knapweed while the larvae of the yellow - <br />winged knapweed moth (Agapeta zoegana) and the knapweed root weevil (Cyphocleonus <br />achates) feed in the roots of both diffuse knapweed and spotted knapweed. The knapweed <br />seedhead weevil (Larinus minutus) is an aggressive insect that consumes seeds and foliage of <br />diffuse and spotted knapweed. Several insect species are available from the Colorado <br />Department of Agriculture. <br />6.2.2.4 Cultural <br />Cultural control of diffuse knapweed includes the aggressive planting of other desirable grasses, <br />forbs, and shrubs to out - compete the diffuse knapweed. Avoiding overgrazing of the land is <br />another cultural control; however, there is no plan to graze this property. <br />6.2.2.5 Integrated Weed Management <br />Integrated weed management for diffuse knapweed includes the combination of mechanical and <br />chemical control. Cultural control should be included with all methods. <br />6.2.3 Musk Thistle <br />6.2.3.1 Mechanical <br />Mechanical control of musk thistle includes severing the taproot below the soil surface or <br />multiple mowing to prevent the plant from going to seed. <br />Weed Management Plan 7 <br />sfir;"2 <br />