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-~t7UL.27.2001 6~0SPM ~ UNITED COMPANIES N0.67B P.33 <br />• <br />Control echo ypnendations for ;~pecie;i on_the Mesa County No~ions Weed List <br />Dyer's Woad (Isatis tinctoria); Winter annual/biennial/short-lived perennial: weed free seed and <br />hay; tillage or hoeing at early flowering stage; herbicides before flowering' <br />Houndstongue (Cynoglossum o-~SclnaTe): Biennial; reseed disturbed sites with fiat growing, <br />competitive grasses; tillage or hoeing at: flowering or ~ seed formation; herbicides at rosette or <br />pre•bud stage <br />Knapweed, Diffuse (Cenraurea th;~tsa): Armua]/sbort-lived perennial; reseed disturbed sites with <br />competitive grasses; seed head fliesZ; tillage, hoeing or herbicides in rosette stage <br />ICnapweed, Russian (Acropolon [Centawea] repens): Perennial; reseed with fast growing grasses <br />after light t171age (plant exudes an allelopathic compotmd that must be re]eaved iinm soil by tillage <br />before planting); herbicide at bud-to bloom stage or in the fall (Gtiutall recommended) <br />Knapweed, Spotted (Centaurea maculnsa): Biennie]/short-lived perennial; reseed with <br />competitive grasses; tt7lage of hoeing at rosette stage; herbicides at rosette stage; seed head flies <br />Leafy Spurge (Euphorbia esula): Perennial with high seed production; reseed with competitive <br />grasses; mowing before seed set fbIlowed by fall herbicide application; sheep or goat grazing <br />followed by faIl herbicide application; zoauy species of flea beetles available <br />Oxeye Daisy (Chrysanthemum leucanthemron): Perennial; weed seed free wIldflower mares; buy <br />Shasta variety of white daisy; herbicide application at or just before flowering <br />Punchtrevine (Goatheads) (7Ffbulus terrestrls): Affiual; repeated tillage, or hoeing before <br />flowering; repeated application of herbicides as seeds germinate (appmxitnate}y every 2 weeks) <br />Purple Loosestrife (Lythrum salicasta): Perennial with extremely high seal production; early <br />detection and removal; remove ®d destroy flower heads after Y~ have bloomed; for sntaIl patches <br />bend removal followed by destruction (burning) of all plant parts; aquatic labeled herbicide (2,4D <br />or Rodeo) before fowcrng, and Roda~ in mid to late summer and early fell before first frost <br />Tamarisk or salt cedar (Tamatix ramosissima and T. parvijlora): Perennial shrub; affiual flooding <br />of bottomlendsi to preve~ seedling estttblisbmmtt; band pulling seedlings; spray herbicides on basal <br />portion of stems of young, smooth barked plants; cut larger plants sad treat crrt stumps within 30 <br />minutes with concentrated herbicide plus an adjuvant (remove all stems from site after cutting - <br />tlrey will resprout if in contact with soil); shade intoleratrt -promote growth of native riparian <br />species that wlll shade out the tamarivk; beetles and mealy bug biological controls not available on <br />Colorado River drainage at this time. <br />Thistle, Bull (Cirslum vulgare): Biennial; weed free hay and seed; weenls and gall flies; grazing <br />by goats and horses; tt~age or hoeing below ground level is rosette stage; remove tbwerheads; <br />herbicides m rosette stage <br />