As to the latest suggestions, row cover: The caterpillars live underground and emerge at night to feed; also, this collection isn't broccoli. I suppose row cover (Reemay) could be laid on the beds in summer, if I knew exactly when to do so, but there is always a little growth here and there that would be harmed by this practice. Dipel: I don't know it. One problem with anything you spray on foliage, however, is that it may promote mold, which can be a worse problem than predatory caterpillars. I'm still leaning toward applying Thuricide (Bt) to bait leaves, if I can figure out which kind would attract the crawling devils. I read that irises are particularly likely to be attacked, so I may try taking leaves from some of the bearded irises out at the margin of the garden (anybody looking for I. albicans?). Jane McGary Portland, Oregon, USA On 3/20/2016 4:58 PM, Bracey Tiede wrote: > Row cover? >