I've had a small colony of Madagascar hissers for four years. There isn't much genetic diversity but otherwise they seem very healthy.
A few months ago, all but one of the males suddenly died within a day. Their eyes turned white, and several also had white growths on their legs. The growths were all the size of a grain of rice and looked like worms, except that they were hard and weren't moving. The dead roaches fell apart at the joints or completely crumbled when I tried to pick them up.
About a year before that, another male had looked the same when it died. But that time, the infection didn't spread around the colony.
I think there were one or two females that died too. Otherwise, the females and the one male weren't affected at all.
Any ideas what caused this?