Over the last several years I have had small dots on the leaves of my catmint. It spreads every year. It doesn't seem to matter what plant. It has spread to every plant that is remotely near. I'm not even sure it started with the cat mint. I have planted an annual in a pot about 5 ft away from the garden and now that plant has it too. Can you help me identify it and recommend a way to get rid of it? Thank you