Check (c) above and compare it to mine, below: The virus must be from seed. Has to be. I will destroy the affected plants. It's a small bamboo with purple stems.
Time to get the flame thrower out, so you dropped Mexico for China? Bambusa funghomii is endemic to Henan province says wiki https://en.wikipedia.org/wiki/Bambusa_funghomii
Mine is the type in (c) it's from Vietnam I think. It was REALLY difficult to germinate. I suppose it was mostly full of virus. Fuck...