Originally Posted by gogreen

The plant specimen diagnostic report came back:

Symptoms on banana fruit submitted to the Florida Extension Plant Diagnostic Clinic resemble those caused by Banana Streak Virus. Once a plant is infected with a virus it is virtually impossible to get rid of it. Do not propagate from infected plants. Purchase plants only from sources who test for viruses. Promote optimal plant health through proper fertilization and irrigation. Please contact your local county extension agent for further questions.

Disappointing news, but at least there's no more guessing about the problem.