Irises: Help with pest identification, please?, 1 by BlissfulGarden

BlissfulGarden wrote:
Alrighty, I expect to lose about 1/2 of my 220 varieties this first year due to climate here in the south. I've got my first rotter in the group, and I need help identifying the pest I found within. The iris is Viva Mexico and I purchased the rhizome from a grower in Mississippi. It is one of only two problem rhizomes at the moment, which I think is pretty good considering the tremendous rain and humidity we have had. The other problem rhizome, Broken Record, was damaged when received, so it was iffy at best. I believe these could be immature borers in the base of the Viva Mexico, but as I've never seen a true borer, I can't be sure. They could just be caterpillars. So... identification help, please? Thanks for any feedback you can provide! Ev :)