I have two problems with my sweetie variety cherry tomatoes, grown organically in Chicago, IL. The plants and green fruits look very healthy (lots of fruit), but many of the green tomatoes are falling off the vine early. Also, the tomatoes that stay on the vine are getting small black spots on them on the sides of the fruit (not on the blossom end). Any guesses out there as to what these problems might be? Are they related? Thanks!