I found this on a relatively new plant. With luck it hasn't spread yet. I immediately removed the ones in the picture with a Q-tip and rubbing alcohol.
But being a chemist and suspicious, I sprayed the entire plant with Sevin.
I hope that takes care of the problem but I will keep it separated for awhile.Dutch Vandervort says, "Ugly! As a preventative, more air circulation.
As a curative, malathion or cygon spray. Cygon is systemic but probably more noxious to us."