It's only the 1st week in August and my basil plants, which had been thriving, have started turning yellow, with bits of brown/black. What's up with that?? They usually keep producing until fall.
What's wrong with my basil?
looks like downy mildew to me.
Look at figure 5
http://vegetablemdonline.ppath.cornell.edu/NewsArticles/BasilDowny.html
Whoa, this is bad news. I agree that it looks exactly like downy mildew, which I had never heard of or seen before. There goes my pesto production and gift line. Guess I gotta go out there and dispose of the darned things. Thanks for yr help.
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