I see this brown patch on tomatoes (attaching pics) in my organic garden. Not sure if it's a deficiency or disease. Need your kind suggestions. Thanks in advance. PS: I didn't apply any calcium or epsom salt or aspirin. Regards, Suresh.
Tomato Fruit Setting Problem
Certified GKH Gardening Expert
It looks like the brown patches are right at the bottoms of the tomatoes where the blossom end was, which means this is a case of blossom end rot. It's a physiological disease caused by lack of calcium in the tomato (but not necessarily in the soil). Here is more information about how to treat it: