musk thistle การใช้

• Musk thistles disappeared by 70 percent to 80 percent in those spots.
• He's waged a 20-year battle against the musk thistle, a European invader that became a pasture scourge much like the multiflora rose.
• Musk thistle was introduced into the eastern North America in the early 19th century, and has been an invasive species there since.
• Thistles which reproduce only via seed, such as musk thistle, are controlled well by this weevil and its seed head destroying larvae.
• The weevil was found to be very effective in reducing the spread of invasive thistles, particularly musk thistle, but also milk, and other thistles.
• For example, the weevil " Rhinocyllus conicus " was released to control musk thistle, " Carduus nutans ", but once in the wild it also attacked many native species, including native thistles such as " C . perplexans ".
• However, the popularity of this form of biological control suffered a jolt a few weeks ago when ecologists in Nebraska reported that a weevil released by USDA in the late 1960s to destroy musk thistle, a destructive pasture and rangeland pest, had turned on native species.