Yes, I'm quite certain it is spring sickness. And I am quite certain my Mom's plants never had it. And no, it doesn't kill the plants, but it does affect vigor, and reduce the number of blooms. My unaffected plants are much more vigorous and floriferous.
So, yes, I will be digging out and sending the affected ones to landfill. Unfortunately we are not allowed to burn here.
Has anyone thought to do tests for plant virus on plants that have this problem?