For two days now I haven't been able to find a caterpillar in the fennel. A very bloated wheelbug was easy enough to find. I also am not seeing any further signs of the foliage being eaten. I shouldn't have removed all those eggs, I think. I didn't know how efficient the wheelbugs could be. There are always some around, but this is the first year I've seen them on the fennel. It's early, so I expect more eggs later. I wonder if I move any wheelbugs to another plant if they will stay or return. Maybe they will relocate on their own now that they've harvested their garden.