Hey bud, I gotta question about cherry trees. Maybe you know something I don't.

One of my young small bonsai cherries presumably died suddenly in the onset of spring, shortly after bud break of leaves. Rusty juice was coating all the branches, as if the buds all became exit wounds for the sap to drain out. My other cherry had a slight reaction, with new leaves wilting yellow, but new shoots strong enough to recover.

Any opinion on what this disease is, or what might have caused it?

We had a three day ice storm in February. I wonder if that can cause the buds to rot and leak sap when they opened in April.