2017-01-25_REVISION - M1998038 - Laserfiche WebLink

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OVERVIEW OF TARGETED WEED SPECIES AND POTENTIAL INVASIVE WEED SPECIES: (SEE THE ENCLOSED NOXISOUS WEED FACT SHEETS)the following bulleted paragraphs provide general descriptions and information about the noxious weeds that are identified on the property during the evaluation process as the primary targets for management. For information purposes at this time descriptions of potential invasive weed species have been included that have been identified in Pueblo County,Colorado and the general area. Turkey Creek Conservation District, Noxious Weed Control Program www.puebloweeds.com can provide guidance and assistance for the control of these and other noxious weeds currently found in Pueblo County. TARGET WEED SPECIES: • Identified Weed Species within the permitted mine boundary. o Tamarisk/Salt Cedar are a perennial non-native deciduous evergreen shrub or small tree that grows from 5 to 20 feet tall. A mature plant can produce up to 600,000 seeds per year. Seeds are viable for up to 45 days under ideal conditions. Ideal conditions for salt cedar seedling survival are saturated soil during the first few weeks of life, a high water table and open sunny ground with little competition from other plants. See following effective treatments chart and the Tamarisk/Salt Cedar fact sheet. POTENTIAL INVASIVE WEED SPECIES: • Potential Invasive Weed Species in Pueblo County and the general area outside of the permitted area. o Musk Thistle is a biennial forb plant that produces solely by seed. Its life cycle is completed in two growing seasons. In its first year, it is a cluster of leaves at ground level called a rosette. During its second year it bolts,forming an elongated flowering stem. Musk thistle only spreads by seed so it is very important to stop seed formation. Seeds are spread mainly by wind and animals. Each plant can produce up to 100,000 seeds. On average, plants produce about 10,000 seeds. Seed viability in the soil is approximately 10 years. Musk thistle seed head weevils are established throughout the state as a biological control method. See the following effective treatments chart and the Musk Thistle fact sheet. o Canada thistle is a deep rooted perennial plant that spreads by seeds and aggressive creeping, horizontal roots called rhizomes. These plants are long-lived and will grow and spread year after year. On average, a mature female plant will produce 1,500 seeds per season with seed viability at approximately 3 years. Seeds are spread mainly by wind. However, Canada thistle spreads mainly through its extensive creeping root system and will form dense colonies. New shoots will emerge from any root fragmentation. While it is important to stop seed formation, with this plant, it is most important to stop its vegetative spread. See the following effective treatments chart and the Canada thistle fact sheet. o Common Teasel is a biennial forb. Mature plants can grow up to over six feet tall and have a taproot. This species reproduces by seed. Common teasel can produce more than 2,000 seeds per plant. Plants die after production of seed has occurred. Seeds can stay viable for up to 14 years. Seeds germinate and establish readily, however, seeds don't generally disperse for from the parent plant. See the following effective treatments chart and the Common Teasel fact sheet. o Hoary Cress commonly known as whitetop is a creeping perennial that is a member of the mustard family. The stems and rosette state may grow up to two feet in height. One plant can produce from 1,200 to 4,800 seeds. The plants emerge in the early spring and set seed by mid-summer. See following effective treatments chart and the Hoary Cress fact sheet.