Could be nutrient (N) deficiency, could be start of early blight. My guess is the latter. I know a lot of people do apply preventative anti-fungal--so that may be something you consider. Although if you're in southern WI, looks like it will rain this afternoon, so might want to wait until tomorrow. I'm sure others will also offer advice. Also, I wouldn't freak out and worry too much either.
Last edited by jmsieglaff; July 11, 2015 at 01:31 PM.
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