I had Caterpillars eating two and a half spikes on my Monnierara last Fall. I noticed that the spikes quit developing when I brought them inside. To my great dismay I found 2 Caterpillars, which had the whole thing decimated, they just left me a couple of buds. I was so disappointed, this was a new plant for me and it did so well over the Summer!
Well, the fish ate the critters!!
Normally I just see these on my variegated Brug, but that plant was in front of the house, far away from the cage.
Elaine, I will look for the Thuricide. It is impossible to keep the Caterpillars clear from the Brug, they have the same coloration.