I'm an observer. Lack of calcium. Fetilize when tomatoes start to form. Use miricle grow for tomatoes. I'm not sure of the "specific" calcium, but fertilizing has worked for me. Timing is everything. Fertilize before flowers, tomatoe plants turn into pine trees. Hold back during flowing. Fertilize when you see the fruits starting to form. Craig Watts kingdomm@worldnet.att.net ---------- From: Ron Hay <ronhay@pacbell.net> To: gardeners@globalgarden.com Subject: [gardeners] Tomatoes with black fungus Date: Wednesday, July 21, 1999 11:03 AM Hi, this year for the first time, we are experiencing a number of tomatoes, Burpee's Early Girl and Big Girl, developing soft bottoms that turn black and slightly flattenend, most of which fruit cannot be salvaged. We carefully dipose of it in the trash so as not to infect our compost pile. Any clues as to cause/cure? Ron, Van Nuys, CA USDA 9b, Sunset 20