My bamboo has lost all its leaves on the top half of the plant, It's a black bamboo and is about 10 years old.
Certified GKH Gardening Expert
Oh no! I suspect a fungal issue. It is best to treat that as soon as possible. Here is a link that will help: https://www.gardeningknowhow.com/ornamental/foliage/bamboo/bamboo-plant-diseases.htm