I recently purchased a patio tomato plant that I have in a 18'' container that I filled with commerical potting soil. The plant is watered regularly and appears to be growing. But so far every tomato that that has grown on the plant begins to discolor with greyish streaks that eventually ruin the fruit.
I have included a picture of a late stage fruit that has already cracked. Also the leaves are starting to curl and some are brown at the bottom. Is this a virus? Is there anything I can do to save this plant?