Eurasian watermilfoil, a weed not native to Frida Lake, has reproduced prolifically since being accidentally introduced there  In order to eliminate the weed, biologists proposed treating infested parts of the lake with a certain herbicide that is nontoxic for humans and aquatic animals  However, the herbicide might damage populations of certain rare plant species that the lake contains
For this reason local officials rejected the proposal
The continuing spread of Eurasian watermilfoil in Frida Lake threatens to choke out the lake's rare plant species.