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pulling and digging are effective if the top 2-4 inches of the tap-root is removed.If hand pulling or digging plants that have <br /> flowered,be sure to bag and dispose the plants to prevent seed dispersal. <br /> Top <br /> Russian knapweed (Acroptilon repens) <br /> Russian knapweed is a perennial that reproduces from seed and vegetative root buds. <br /> Russian knapweed grows to 3 feet tall and produces pink to lavender flowers with <br /> papery bracts beneath. <br /> '. Seed remains viable in the <br /> soil for 3 years.Russian <br /> knapweed eliminates <br /> competing vegetation by <br /> exuding an allelopathic <br /> chemical that inhibits <br /> growth of other plants and <br /> can result in solid stands. <br /> Rusaar h:ape;ed flo%cat This noxious weed is toxic 7 <br /> to horses and unpalatabley <br /> to other livestock. rl <br /> The most effective herbicides for controlling Russian knapweed are R ttu.ian k��,i�rvecd}iui�h <br /> Tordon,Transline,Milestone,Curtail,Redeem,Telar,and Plateau. bcg[till g,to tak"o%er 11,1:field <br /> There are currently no insect biocontrol agents available for control of <br /> Russian knapweed. <br /> Mowing can reduce seed production and stress the plants,and combined with an herbicide application in the fall,provides <br /> excellent control. <br /> A Top <br /> Leafy spurge (Euphorbia esula) <br /> �r Leafy spurge is a deep-rooted perennial that reproduces by rootstalks and seed.Leafy <br /> spurge emerges in early spring,flowers in April/May.Plants grow to 3 feet tall with <br /> yellow-green flowers that,when mature,can propel seeds 15 feet.Seeds can remain <br /> viable for 8 years.The entire plant contains a milky latex that can be toxic to livestock <br /> r <br /> .. and irritating to humans.Leafy spurge is the most difficult-to-control weed in <br /> y, Larimer County. <br /> Paramount,tank mixed <br /> with Overdrive provides " <br /> effective control of leafy <br /> A close-up of IcL, spurge Homers <br /> spurge without injuring <br /> grass or trees.Other <br /> effective herbicides for control of leafy spurge are Perspective,Tordon, <br /> Tordon/2,4-D,dicamba,and Plateau(fall applied).Tordon,Perspective <br /> and Plateau can be very effective,but the higher application rates <br /> necessary for good control can cause injury to grasses or trees. <br /> Several species of flea beetle(Apthona spp.) can be effective in <br /> significantly reducing stands of leafy spurge.Results are often site- <br /> specific,varying according to soil type,moisture conditions,and other Leaf. .purge spreading as Ear a.the eye can see.. <br /> factors.Leafy spurge is not palatable to horses or cattle and the latex in <br /> the plant can cause mouth blistering.Sheep and goats are immune to the blistering and can be trained to browse leafy spurge and <br />