Missoula County MSU Extension Service Weed District

Weeds Management > Insects

St. Johnswort Insects

Common Name: St. Johnswort inchworm
Species: Aplocera plagiata
Status: Widely established
Year Released: 1989
Larvae feed on leaves and flowers.



Common Name: Klamath weed beetle
Species: Chrysolina quadrigemina
Status: Widely established
Year Released: 1946 in California
Both adults and larvae attach the leaves.