Random Insect: Bean leaf beetle

Bean leaf beetle (Cerotoma trifurcata, Chrysomelidae) photographed 03/20/2011 near Blissfield Michigan.

I recently found this bean leaf beetle (Cerotoma trifurcata, Chrysomelidae) overwintering in a rotting log.  It was a bit sluggish but seemed displeased with being handled.  Although colors and patterns can vary within this species, one consistent characteristic is the black triangle on the front of the elytra (the hard wing covers).

Bean leaf beetle (Cerotoma trifurcata, Chrysomelidae) photographed 03/20/2011 near Blissfield Michigan.

These beetles feed primarily on the leaves of legumes, especially the soybeans (Glycine max, Fabaceae) that are abundantly grown here in southern Michigan.  It’s one of the most damaging soybean pests in North America.

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About Jeremy Sell

Science and nature nerd.
This entry was posted in Botany, Ecology, Entomology, Random Insect and tagged , , . Bookmark the permalink.

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