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<br />Control Recommendations for species oo the Mesa County Noxious 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 officinale): Bienrrial; reseed distwbed sites with fast growing, <br />competitive grasses; tillage or hoeing at flowering or early seed formation; herbicides at rosette or <br />pre-bud stage <br />Knapweed, Diffuse (Centaurea diffusa): AnnuaUshort-lived perennial; reseed distwbed sites with <br />competitive grasses; seed head fliesZ; tillage, hoeing or herbicides in rosette stage <br />ICnapweed, Russian (Acroptilon [Centaurea] repens): Perennial; reseed with fast growing grasses <br />after light tillage (plant exudes an allelopathic compound that must be released from soil by tillage <br />before planting); herbicide at bud-to-bloom stage or in the faq (Curtail recommended) <br />Knapweed, Spotted (Centaurea maculosa): BienniaUshort-lived perennial; reseed with <br />competitive grasses; tillage or hoeing at rosette stage; herbicides at rosette stage; seed head flies <br />Leafy Spwge (Euphorbia esula): Perennial with high seed production; reseed with competitive <br />grasses; mowing before seed set followed by fall herbicide application; sheep or goat grazing <br />followed by fall herbicide application; many species of flea beetles available <br />Oxeye Daisy (Chrysanthemum leucanthemum): Perennial; weed seed free wildflower mixes; buy <br />Shasta variety of white daisy; herbicide application at or just before flowering <br />Punctwevine (Goatheads) (T ribulus terrestris): Annual; repeated tillage, or hoeing before <br />flowering; repeated application of herbicides as seeds germinate (approximately every 2 weeks) <br />Purple Loosestrife (Lythrum salicaria): Perennial with extremely high seed production; early <br />detection and removal; remove and destroy flower heads after % have bloomed; for small patches <br />hand removal followed by destruction (burning) of all plant gorts; aquatic labeled herbicide (2,4-D <br />or Rodeo) before flowering, and Rodeo in mid to late summer and early fall before first frost <br />Tamarisk or salt cedar (Tamarix ramosissima and T. parviflora): Perennial shrub; annual flooding <br />of bottomlands to prevent seedling establishment hand pulling seedlings; spray herbicides on basal <br />portion of stems of young, smooth bazked plants; cut larger plants and treat cut stumps within 30 <br />minutes with concentrated herbicide plus an adjuvant (remove all stems from site after cutting - <br />they will resprout if in contact with soil); shade intolerant -promote growth of native riparian <br />species that will shade out the tamarisk; beetles and mealy bug biological controls not available on <br />Colorado River drainage at tlils time. <br />Thistle, Bull (Cirsium vulgare): Biennial; weed free hay and seed; weevils and gall flies; grazing <br />by goats and horses; tillage or hoeing below ground level in rosette stage; remove flowerheads; <br />herbicides in rosette stage <br />