I don't mind if caterpillars chomp on my plants - bananas included. I do mind, with assassinistic exception, to Devil's Horses chomping on anything I have and I kill all of them with WD40 no matter the size. The first hatching came out 2 days ago and they are now dead.
http://farm2.static.flickr.com/1264/...b5bf5f7662.jpg
http://www.sxc.hu/pic/m/w/wh/whitnes...vils_horse.jpg