Since Hermine dropped eight inches of rain in our garden, the crotons have been undergoing leaf drop. Many that were once nice and full, are thin or getting thin and dropping leaves every day. Some did have some spider mites in the past, but now there are few or none to be seen and leaves continue to drop. Even many that have never had mites are dropping leaves. Some have a tiny dark spot or two scattered on the back of leaves. I don't know what that is, but many don't have anything visible. Does anyone know what this could be and what I could try to stop it? I keep picking up leaves just in case there's any disease I don't see, but I'm at a loss here and really want it to stop.