of Agriculture Conservation Services Division 700 Kipling Street Suite 4000 Lakewood, CO 80215 303-239-4100 Flowers are yellowish-green and have a pair of heart shaped yellow- green bracts below each inconspicuous flower. By 1992, it was estimated that there were 800,000 infested acres in the central, northern, and western parts of the state, in addition to the Twin Cities area. It has an extensive root system with vast nutrient reserves that allow recovery from stresses and control efforts. Several insect species have been released by the USDA/APHIS that affect spurge. 3. Leaves are alternate, narrow, linear, ¼ inch wide, and 1 to 4 inches long. It is known to be present in Larimer and Morgan Counties, but probably has a considerably wider range within the state. Of the flea beetles three species have been found to be most effective. Frequent mowings through summer reduces the herbicide application rate needed in the fall. Leafy Spurge Biocontrol. Yampa River Leafy Spurge Project needs your support for improving and increasing community outreach and education efforts! Contact the Adams County Weed Department or your local extension office for details on these flea beetles. Leafy spurge is of European origin. Colorado List B - Control required in Jefferson County. News Articles "Planting the seeds of knowledge: Northwest Colorado kids learn ecological lessons on scourge of leafy spurge," Craig Daily Press, July 12, 2019. Leafy spurge is a non-native perennial forb. The plant produces milky latex that irritates the skin and is poisonous to some animals. Insectary Brochure. 54 days left. Sequential glyphosate (e.g. This plant has clusters of small yellow or greenish flowers at the end of thin stalks. Newsletters. 2014 Newsletter. It is probably the most serious noxious weed threat in Colorado. The roots are brown and contain numerous pink buds that generally produce new shoots or roots. The stems are erect, to 1 m tall, glabrous, and contain latex. The stems contain a milky sap that is damaging to eyes and sensitive skin, and causes severe irritation of the mouth and digestive tract in cattle. In response, approximately 9 million leafy spurge beetles (Aphthona lacertosa) were released at ove… The … Most non-native plant species are not a problem, and some are considered beneficial. 2015 Newsletter. 2010 Newsletter. Leafy spurge is a master at self preservation, according to the Colorado State University Extension. According to a Colorado State University fact sheet, “A 1990 survey found 44,000 acres in Colorado infested with leafy spurge. In 2002, the Colorado Department of Agriculture conducted a follow-up survey and found more than 73,800 infested acres of leafy spurge (Figure 1). The flower two large petals, appearing like a cup or disk below. Leafy Spurge . 2. 1. Leafy spurge invades prairies, pastures, and other open areas. To date there have been thousands of successful release sites and over a million acres reclaimed. Mowing spurge a regular intervals 4 to 6 times per spring/summer is an effective stress treatment that will reduce root food reserves and prevent seed set. Alaska Exotic Plants Information Clearinghouse (AKEPIC): Species Biography - Leafy Spurge (Feb 7, 2011) (PDF | 146 KB) University of Alaska - Anchorage. The most effective of these are five species of flea beetles; Aphthona nigriscutis, The roots are brown and contain numerous pink buds that generally produce new shoots or roots. 2002. Leafy spurge Adams County Weed Department 9755 Henderson Rd Brighton, CO 80601 303-637-8115 Flowers are yellowish-green and have a pair of heart shaped yellow-green bracts below each inconspicuous flower. | The information contained herein is provided as a public service with the understanding that Colorado State University makes no warranties, either expressed or implied, concerning the accuracy, completeness, reliability, or suitability of the information. 2. It is considered a noxious weed and is included on the Colorado and Adams County Noxious Weed Lists. Plants included in the summaries are those identified as non-native species by the USDA Plants Database. Colorado State University web pages do not endorse any commercial providers or their products. It is considered a noxious weed and is included on the Colorado and Adams County Noxious Weed Lists. Leafy spurge is a nonnative, deep-rooted perennial that spreads by seed and extensive, creeping roots. Leafy Spurge Biocontrol. Leafy spurge is an extremely difficult plant to control because of its extensive sprouting root system and is probably the most serious noxious weed threat in Colorado. There is wide variety in the genus, but all spurges contain a milky sap in the stems and leaves. Vol. How bad can it be? This deep-rooted perennial forb spreads by seed and by aggressive, creeping horizontal roots (rhizomes). A perennial weed, reproducing by seeds and creeping rootstocks. Cultivation can be done at two to four week intervals, but is costly and can bare soil to erosive factors. However, multiple stresses applied to plants are very effective. Lauren Dodd "Community Agriculture Alliance: Leafy Spurge is Bad News," Steamboat Pilot & Today, June 18, 2019. Leafy spurge is a member of a very large family of plants with at least 2000 species. It was introduced to Minnesota in 1890 as seed in a bushel of oats from Russia. 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