So... almost no leaves left on my brussels sprout plants... Very hungry critters... I can only guess that it's the butterflies that's been in there earlier. Two of the other brussels sprouts were almost undetected. I had to rinse some of the larvae off. I thought I should at least keep two plants to myself. Next summer I'll wrap them up in fiber cloth! Or next week even... If I can save the plants...
It's a bit of mixed feelings... since I really love butterflies... but, I really love brussels sprouts too... Perhaps the plants will recover.