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If you have any questions, please contact the Weld County Public Works <br /> Dept., Weed Division at(970) 304-6496 ext. 3770. Please visit our website at ' <br /> www.weldweeds.org. <br /> Recommended management methods: ' <br /> Cultural- Establishment of selected, aggressive grasses can be an effective <br /> cultural control of perennial pepperweed. Contact your local CSU Extension <br /> office or Natural Resources Conservation Service office for seed mix ' <br /> recommendations. Good grazing management will stimulate grass growth and <br /> keep pastures healthy. Healthy pastures may be more resistant to perennial <br /> pepperweed invasion. Bare spots caused by overgrazing are prime habitat for t <br /> weed infestations. <br /> Mechanical- Due to the extensive root system,hand-pulling this plant is not a <br /> viable option. Mechanical control options are typically ineffective. With the ' <br /> exception of flooding,no non-chemical treatments have been proven effective. <br /> Biological No known biological control agents available at this time. <br /> Development of biological controls has been hampered by a number of closely ' <br /> related native plants, some on the rare and endangered species list. <br /> Herbicides -The following are recommendations for herbicides that can be ' <br /> applied to range and pasturelands. Always read, understand, and follow label <br /> directions. The herbicide label is the LAW! <br /> Herbicide Rate Application Timin Comments <br /> t <br /> 2,4-D Amine 3 qt./acre Spring-bolting to early bud stage and fall rosette stage.DO <br /> or NOT apply when outside temperatures will exceed 85 degrees. ' <br /> 2 oz/gal water for each Add non-ionic surfactant @ 0.32 oz/gal water or <br /> product 1 t/100 gal water. <br /> Escort 1 oz/acre Apply from bud to early bloom stage or at fall rosette. Add one <br /> or teaspoon of household ammonia to 3 gallons of water plus the ' <br /> 1.3 grams to 3 gallons of water non-ionic surfactant 0.32oz/gal water or 1 t/100 gal water. <br /> Telar 1 oz/acre Apply at prebloom to bloom or at fall rosette stage.Add a non- <br /> or ionic surfactant @ 0.32oz/gal water or 1 gt/100 gal water. ' <br /> 3/4 of a gram to 3 gallons water <br /> Round-Up 4 qts/acre Spring-at early bud stage and/or fall rosette stage.Add a non- <br /> or ionic surfactant @ 0.32oz/gal water or 1 qt/l00 gal water. <br /> 2.5 oz/gal water ' <br /> Plateau 8 oz./acre Spring apply to rosette stage or at flowering or at fall rosette. <br /> or Add a methylated seed oil surfactant(MSO)@ 0.32 oz/gal <br /> 0.25 oz/gal water water or 1 t/100 gal water. <br /> Photo of perennial pepperweed flowers ' <br /> courtesy of WA State Noxious Weed Control Board <br />