Phil-
So, so sorry for the confusion. Thanks for calling attention to my posting. I should have explained this listed information much better.
I have listed three alternative treatments. Pick one, and try it for a few days. These potential remedies are easy to use, totally safe, and easily prepared. There are also organic preparations that are widely available. To be effective all the leaves, and I mean every leaf... has to be completely coated with these solutions and applied often, until the symptoms go away. The best prevention is to keep the leaves dry, never wet foliage when watering and provide good air circulation so that rain soaked leaves can dry quickly.
Commercial products like Bordeaux Mixture (copper sulphate) are probably more effective, but some may not want to use strong chemicals, etc. around edibles.
Thanks for the interest.
Frank