I have been doing basically the same things with all my bananas, but while looking over my Namwah twins today, I noticed something odd. Most likely some kind of fertilizer issue, but not sure. Been putting a couple handfuls of black kow type .5-.5-.5 manure fertilizer around all my plants every couple weeks during summer growth season, and a 3 finger pinch or two of potassium sulphate on each one at the same time. These are pics of the oddity on the leaf edges I saw today. This is only on the most recent couple leaves, so I doubt it's some leaf streak disease as they tend to begin on older leaves, and on the tips. Please take a look and let me know what you think. My guess is too much potassium sulphate as it is the newest addition to my routine and this hasn't happened before. Either that or too much water, as I have been watering daily in the summer heat, unless we get more than a quarter inch of rain. These plants are about 3-4 feet tall at the top of the PS.
This is not the sunlight, those bright streaks are on the leaf...
From underneath one of the leaves:
It may be possible it is nitrogen as well, I emptied my compost barrel between the two only a couple days ago too. As is common with barrel compost, it was partly rotted instead of composted. After I dumped it there, I, of course, watered it down. Has anyone seen this before and can pin down what I did so I don't do it again? They are still growing quite rapidly so I don't think I will lose them or anything...
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Varieties I supposedly bought: Manzano, Cavendish, Blue Java, Sweetheart, and Gros Michel.
What it seems I actually have: Brazilian, Cavendish, Namwah, Dwarf Red, Gros Michel, Pisang Ceylon, Veinte Cohol and SH 3640, and American Goldfinger. FHIA 1, Paggi and FHIA 17... Always room for one more.