Poison hemlock (Conium maculatum) (Apiaceae), a noxious Eurasian weed extensively naturalized throughout North America, is characteristically attacked by few insects. Over the past two decades, an introduced oecophorid caterpillar, Agonopterix alstroemeriana, has been reported infesting poison hemlock, its sole host in its area of indigeneity, in parts of the northeastern and western United States. We report for the first time evidence of established midwestern populations of this species. We also report poison hemlock as a host plant for the polyphagous lepidopterans Eupithecia miserulata, Trichoplusia ni, and Spilosoma virginica.
Berenbaum, May R. and Harrison, Terry L.
"Agonopterix Alstroemeriana (Oecophoridae) and Other Lepidopteran Associates of Poison Hemlock (Conium Maculatum) in East Central Illinois,"
The Great Lakes Entomologist, vol 27
Available at: https://scholar.valpo.edu/tgle/vol27/iss1/1