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Nelson Mining Resource <br /> Integrated Noxious Weed Management Plan <br /> August 2019 <br /> Page 4 <br /> Noxious Weed Species Identified State Management Designation Infestation Affected <br /> (Scientific Name) List Priority Goal Density Acreage <br /> Field Bindweed <br /> (Convolvulus arvensis) C 2nd Suppression Heavy 6 acres <br /> TOTAL AFFECTED ACRES (approx.)= 10 acres* <br /> Notes: <br /> *=Total affected acres do not"add up"because multiple weeds are found in the same areas. <br /> ' ■ Saltcedar/Tamarisk(Tamarix ramosissima): Saltcedar, aka tamarisk(Tamarix <br /> ramosissima), is a non-native deciduous or evergreen shrub or small tree that grows from <br /> 5 to 20 feet tall. The bark on saplings and stems is reddish-brown. The leaves are small <br /> ' and scale-like and the flowers are pink to white and 5-petaled. Saltcedar reproduces by <br /> seeds as well as vegetative. A mature plant can produce up to 600,000 seeds per year. <br /> ' Seeds are viable for up to 45 days under ideal conditions. Saltcedar buds break dormancy <br /> in February or March. Flowering occurs anytime between April and August. Ideal <br /> conditions for saltcedar seedling survival are saturated soil during the first few weeks of <br /> ' life, a high water table, and open sunny ground with little competition from other plants. <br /> ■ Russian Olive (Elaeapnus anaustifolia): Russian olive is a non-native deciduous shrub <br /> or small tree that can reach 10-25 feet tall. The foliage has an overall silvery appearance. <br /> The leaves are arranged alternately, 2-3 inches long and narrow with smooth margins. <br /> The upper surface is gray-green while the lower surface and leaf stalks are silvery-gray. <br /> The bark is dark reddish-brown in color and usually has 1-2-inch thorns. The twigs also <br /> have a silver-gray appearance. The flowers appear between May and June, they are <br /> yellow, bell shaped and arranged in clusters. The tree starts to produce fruit at 3 year of <br /> age. The fruit is shaped like a small olive and contain a single seed. The seeds are viable <br /> for up to 3 years. The Russian olive spreads mostly through seeds but can re-grow from <br /> ' injury. The Russian olive is very adaptable. The seedlings are tolerant of shade and <br /> drought conditions. It can thrive in a variety of soil types, including bare mineral <br /> ' substrates. They can grow between sea level and 8,000 feet. <br /> ■ Canada Thistle (Cirsium arvense): Canada thistle (Cirsium arvense) is a non-native <br /> ' deep-rooted perennial that spreads by seeds and aggressive, creeping horizontal roots <br /> (rhizomes). Canada thistle can grow 2 to 5 feet in height. The leaves are oblong, spiny, <br /> bright green in color, and are only slightly hairy on the undersurface. Flowers occur in <br /> ' small clusters that form on the ends of branches. They are about 1 cm in diameter, tubular <br /> shaped, and vary from white to purple in color with a strong vanilla scent (female <br /> ' flowers). <br /> Canada thistle emerges from its root system from late April through May. It begins to <br /> ' flower in late spring to early summer with increase in day length. Canada thistle only <br /> t <br />