I just returned from the farmer's market with a lovely little gem of wisdom. Plant collars work pretty well but aren't a surefire defense against cutworms if you put it on with a cutworm sleeping at the base of the plant, which is what happened to another plant last night. I discovered that cutworms cut down a plant by circling the base. If you put a toothpick or scewer at the base of the plant, it can't fully circle it! Problem solved...now I need to find out what is stripping the leaves off my pepper plants.