I have a habit of breaking out old Agave and Yucca bloom stems to see if anything has been working on them. At this site I broke out a couple of old stems (easy) and found that some large beetle had mined it and left a lot of frass typical of Tragidion. So then I attacked bloom stems that were only a year or two old. When they broke at the base I noted the occasional larvae and put the stems in a can for to see what would happen. I was rewarded with five females and one male from three stems.