Gabe15

I don't think you will find any useful information by researching banana diseases. Young tissue cultured plants are susceptible to all sorts of mild infections from microbes that would not normally cause disease, it could be something like that or some physiological reaction of that variety to the conditions it is in. TC plants are very weak at first, but as they grow they will get stronger. If the plants are still growing they should be fine, just make sure not to keep the humidity too high as this will promote the pathogens. TC plants only need to be kept in high humidity for 1-2 weeks after they come out of the vessels, after that they should be hardened off by taking them out of high humidity and allowed to get tougher.

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Growing bananas in Colorado, Washington, Hawaii since 2004. Commercial banana farmer, 200+ varieties.