That one Gabe, looks like a tent caterpillar. Several have fallen out of trees near my irises but I have not seen them eat anything. Could be anything but it is not an iris borer.
My new problem which I have never had before is that mustard seed looking thing. I found my Another Woman (one I have dreamed of owning and did not bloom this year) was fallen over and yellowing. I tried to get inside the leaf to see if it was a borer and the whole set of leaves fell off. When I checked for frass, there were those mustard seed things. I will have to research that unless y'all have some info. Should I remove it from the bed? Treat it with something? No clue....