Cause There have been odds and ends of leaf spots sent in to the OSU Plant Clinic over the years. A few fungal ones (Cyphellophora sp. and Cladosporium herbarum formerly C. graminum), a bacteria (Pseudomonas sp.) and several abiotic (non-living) problems. The fungi and bacteria can overwinter in plant debris and are favored by conditions that keep leaves wet.
Symptoms Necrotic black spots.
Cultural control
- Space plants for better air flow.
- Remove and destroy infected plants or plant parts.
- Avoid sprinkler irrigation.
Chemical control No fungicides are registered for use on bamboo.
Reference Yamamoto, W. 1959. Some species of Cladosporium from Japan. Science Reports of the Hyogo University of Agriculture, Series, Agriculture, 4:1-6.