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Figure 1. Several views of Russian knapweed (Centaurea repens). <br />Photo into extension usu eau wee lwebs 'Id~ncRu@Kn ~d hnn Available 29 Dec 2005. <br />Russian knapweed primarily regenerates new shoots from dark, scaly, rhizomes several inches <br />below the soil surface. Roots from a recently established plant expand rapidly and may cover <br />up to 12 square yards in two growing seasons. Reproduction via seed is secondary to vegeta- <br />tive reproduction. a Vend reflected in the lower rate of spread of Russian knapweed relative to <br />other knapweeds", but seeds remain viable for two to three years. <br />Long term control of Russian knapweed requires annual evaluations of the infested site and re- <br />sponsive management. The key to Russian knapweed control is to present continual stress and <br />cause the weed to expend belowground nutrient stores. A single control strategy, such as mow- <br />ing or herbicide application, usually is not sufficient. The best management plan irnegrates c~l- <br />Proper idenUl~cabon of Russian knapweetl is important Oecause 4 may be found in the same areas as other knap- <br />weeds, and diNerent control strategies are neoded. <br />~- KnanwPr~tl Qt~tiSlc`lfl ~ <br />