A bunch of my tomato plants are wilting (5 or more a day), and upon inspection, I saw (on most) what looked like a pinched stem below the soil level. I found a tiny red bug in one, but I don't know if that is the problem or something else. The tomatoes are only about 4 inches tall and still in individual containers - I'm growing a few hundred organic heirlooms for us and friends and I can't afford to lose them now. Can anybody tell me what is going on and how to make it stop? Please!