I am seeing some aphids on the plants. Check out the undersides of your leaves. They will be telling you more than to tops are showing. I do think it is more of an insect problem than any type of disease or deficiency.
If it is insects, then I would start by washing both the top and especially the undersides of the leaves with soap. People here use insecticidal soap, Dawn or Flea and Tick Shampoos. You may have to use an insecticide, but I prefer to start with soap or DE or a mix of the two.
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~ Patti ~
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