Ken, On this picture I think it is a Sciarid fly's larvae http://flickr.com/photos/amarguy/… But this one looks more like a caterpillar http://flickr.com/photos/amarguy/… You may try to use Citation, it is the best systemic fly larvae killer, and try also Coragen/Steward (active ingredient rynaxypyr = klorantraniliprole) this is also sytemic and is very affective against insects with "chewing mouth" this means it is good gor caterpillars, and beetles but ineffective against like aphids, leafhoppers, thrips... My opinion is that the Sciarid flys attacked because the bulb was allready rotting. Their "mouth" is not strong enough to eat mature plant tissues, but can consume seedlings, especially ones from small seeds, like begonia. It can happen that the pinkish larvae started the whole rotting thing. But that is only a guess. Sometimes i did cut my Hippeastrum bulbs and showed a similar rot, i was thinkink Stagonospora caused the rot. Did you have any Stagonospora infection in your collection lately? I hope this will not spread to other bulbs, i know they are quite valuable! Janos Hungary