I bought some plants at Costco about a month ago and have noticed some of the lower leaves are showing brown spots that are growing in size. I cut off all the branches that had the brown, but what to do next? It would seem it might be early blight but don't know for sure. everything I've read says to treat with a fungicide, but is that safe later when you eat the fruit? The cherry tomato plant(called 100's) already has some blossoms.