Bamboo culms have random discoloration throughout and dark, rotten-looking spots at base. The leaves are spotted and shredding. Plants were transplanted in early spring of 2008 from a mature grove (yellow groove, I believe) which received little to no maintenance.

I first noticed discoloration within a few months of transplanting, but they might have been there from the start. Last year's culms shot up clean but have developed spots similar to those of the existing culms over the course of the year. See link below for pictures.

The bamboo is planted underneath mature oak trees and receives mostly filtered sunlight during the spring and summer months with only a few hours of direct sunlight. There is a several inch layer of leaf mulch covering the soil.

1. What is happening?

2. What can I do?

Thank you for any help you can offer.

Here is a link that might be useful: Diseased Bamboo Culms