I have a pot plant with Swiss cheese kind of foliage that has got some problem possibly some sort of parasite or fungal infection, I have no idea. It's like red-brown rust that brushes off fairly ...
I have a threesome of tomato plants planted in on my porch. All three have some leaves that seem to be a bit white and powdery. One of the leaves has even started to turn a bit brown. I don't think ...
Very early this year (starting in mid-May) my peonies' foliage was covered in whitish-gray powdery mold. What is it and what if anything should I do about it?