Saint john's wort beetle
Chrysolina hyperici, the Saint John's wort beetle is a species of beetles of the family Chrysomelidae.
Chrysolina hyperici is most often known in English by the common names "St. Johnswort Beetle", "Saint John's Wort Beetle" or close variations. In the United States C. hyperici is also known by the common name "klamathweed beetle" from one of the common names of Hypericum perforatum.
Originally distributed in Europa and Asia, it has been introduced in other places as biological control of Hypericum perforatum.
The species lays up to 2.000 eggs on the host plant during the early fall. They lay their eggs on the undersides of leaves of new fall basal growth on its host plant, St. John's Wort (Hypericum perforatum). The larvae feed for a month on the leaves, emerging at night and hiding during the day. When full grown they move to the soil to pupate. After two weeks they emerge as adults. In the spring the adults feed upon new growth of their host plant.
