Mary Ann, I think that map just shows sightings that have been reported on BugGuide, which is more of an insect identification guide than a plant pest one. On the Butterflies and Moths of North America site it gives the range as: " Nova Scotia to South Carolina, west to Minnesota, Missouri, and Mississippi." (Learn something every day - gladiolus sometimes a host).
http://www.butterfliesandmoths...
A caterpillar book I have gives the range as "Minnesota to Nova Scotia to South Carolina and Kansas." So I looked on Google and there are a few references to it in Kentucky.
I was able to grow bearded irises here for several years before it found them.