One problem that can cause that look is flea beetles. I had them really bad a couple of weeks ago. I thoroughly sprayed the tops and bottoms of the leaves as well as the surrounding mulch with a mix of soapy water and a bit of Permethrin. In twenty four hours it looked like my plants had received a good dose of fertilizer the leaves were so much greener and smoother looking. If you decide to do this wait til late in the evening so as not to harm honey bees which are frequently on them in the mornings.
Bill
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