The purple spotted knapweed flower is attractive to bees and a good nectar producer: However, once it gains a foothold, spotted knapweed kills competing vegetation and creates conditions for its own spread. Photo by James H. Miller, USDA Forest Service, Bugwood.org photo Inset by Marisa Williams, University of Arkansas, Bugwood.org Michigan beekeepers have added one more item to the list of things threatening their industry—a gradual reduction in a major bee forage crop they call star thistle. In August, the state Department of Agriculture approved the release of two biocontrol agents—beetles—that feed on spotted knapweed, an exotic, invasive weed species […]
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