What's That Bug? does not endorse extermination

Yellow butterfly
October 12, 2009
Found in the tall bluestem prairie, October 5, 2009
Tom Fuller
Goose Lake Prairie, Illinois

Orange Sulphur

Orange Sulphur

Hi Tom,
This is a female Orange Sulphur, Colias eurytheme.  The female can be distinguished by the spots in the black wing borders.  The caterpillars feed on clover, alfalfa and other legumes.  You can search BugGuide for more information on the species.

What's That Bug? does not endorse extermination
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