I don't know what kind of insect you have, but frankly I think you are fighting a losing battle trying to save these bulbs. That red stuff is rot. Sometimes planting in the ground can be an issue in Florida, For ten years I attempted to put them in ground, and finally gave up. I was buying expensive bulbs that deteriorated within a few years. That's why I went to only planting Amaryllis in sterile soil in big pots. The. pots, are resting on brick pavers, so they drain well. I dealt with too much moisture, too much disease, and too many bugs, grubs and larva. I just did a quick internet search about insect pests of Amaryllis. Most of the bulb grubs, etc. eat out the inside of the bulb. The entrance wound is the access point for disease. There are systemic insecticides/ fungicides that I occasionally use, they are marketed for Roses. I question their effectiveness on advanced problems.
