From the St. Louis Post-Dispatch:
An effort to fight an invasive plant with insects that eat it has drawn opposition from beekeepers who worry it will leave them without an adequate source of nectar and pollen for their honeybees.
Researchers in Michigan released bugs that feed on spotted knapweed earlier this year. Western states and big honey producers, such as Minnesota and Wisconsin, previously used so-called biological control to help restrain the flowering plant, which produces chemicals that deter the growth of other plants and crowds out native vegetation.
Michigan is among the nation's top 10 honey producers and the home of beekeepers who ship hives as far as Florida and California to pollinate orchards and fields. Beekeepers argue that if they're hurt, the farmers who rely on them will suffer too.