Is this mildew on my asters??
I went out into the garden today to observe growth and noticed this unusual foam like substance on a variety of asters. It is the consistency of foam soap coming out of the crevices between the leaves.
Is this a form of mildew? How should I treat it?
It does seem to be affecting the plants as the ones who have it seem to be weaker than the ones that to do not. I hope it doesn't spread before I have time to treat it!