Great news about the catalpas, Theo. If you have bluegills, try a piece and see how they do.
Dont hear of them near as much as long ago. I was told that they are very sensitive to pollution. I know that is not the case for the tomato hornworm, though. I get them in Houston, on my tomatoes, along with blight, mosaic, nematodes, etc.
As, Ewest said, keep the excess in sawdust, cornmeal or such, in the refrig.
