Michigan officials are seeking public input on whether to allow the release of imported weevils to fight invasive spotted knapweed. This plant, introduced from Europe or Asia in the early 1900s, has spread across the state, choking out native plants while providing nectar for pollinators.
The Michigan Department of Agriculture & Rural Development is collecting opinions until March 6 on releasing two types of Eurasian beetles—seedhead weevils and root boring weevils—that feed only on knapweed.
Supporters of the plan see the insects as a helpful tool to control the plant, which produces thousands of seeds that can last up to eight years and releases toxins that harm other plants.
According to the non-profit, non-partisan news agency Bridge Michigan, supporters say the beetles will slow the weed’s spread by attacking its seeds and roots. Studies show the beetles will die off when the plant is gone. The seedhead weevil has been used in past scientific studies.
However, some beekeepers oppose the plan, saying spotted knapweed is a valuable nectar source for many pollinators, and removing it could harm the local ecosystem.
This isn’t the first time Michigan has used imported bugs to control invasive plants; in the past, beetles helped reduce purple loosestrife, which was in the process of taking over wetland areas.
Visit michigan.gov/mdard for more information.