National Insect Week Part 2 – Chrysolina Beetles and St. John’s Wort

National Insect Week Part 2 Chrysolina Beetles and St. John's Wort

While on my weekly IPM scouting mission I found dozens of these little metallic black beetles relaxing after a large meal of St. John’s Wort . I am pretty sure these are Chrysolina hyperici beetles. Chrysolina beetles come in wide variety of wonderful colours. Check out the photographs of Chrysolina americana and Chrysolina fastuosa at this web site : http://www.eakringbirds.com/eakringbirds6/insectschrysolinabeetles.htm, to see some spectacular examples of this beetle.
St. John’s Wort is a very popular medicinal herb, but also a serious noxious weed on grazing lands. Three types of Chrysolina beetles were released in Ontario in the 1950’s as a bio-control against St. John’s Wort and Chrysolina hyperici was one of the types. For more information by Ontario Agriculture, Food and Rural Affairs click on the photo.

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