The base of the clums on my clumping bamboo is turning black. I fear I could lose the plant. I also see a white cotton looking growth on some of the stems. Do you know what this could be and how I can treat it? Thank you Robin
Certified GKH Gardening Expert
It sounds like Sooty Mold that is caused by an infestation, likely Scale or Mealybug from your description.
This article will help you.