The condition is caused by a lack of calcium in the plant when the tomatoes are the size of
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marbles. You can stop the problem on currently affected plants but you'll have to throw away the tomatoes that are bad now.
Use a calcium chloride spray (Stop-Rot, etc.) to help cure this disorder. Begin spraying plants when the first fruit cluster is seen. Apply calcium chloride every 7 to 10 days until 4 applications have been applied. Spray plants until solution drips off the plant.
Use a calcium chloride spray (Stop-Rot, etc.) to help cure this disorder. Begin spraying plants when the first fruit cluster is seen. Apply calcium chloride every 7 to 10 days until 4 applications have been applied. Spray plants until solution drips off the plant.