Fungal disease attacks black walnut trees in eight Western states - Sacramento News - Local and Breaking Sacramento News Sacramento Bee:
Fungal disease attacks black walnut trees in eight Western states
By Li Lou
Published: Wednesday, Aug. 26, 2009 - 12:00 am Page 1B
Diners in the courtyard of Sophia's Thai Bar and Kitchen in Davis will want to enjoy the shade while they can, because the black walnut tree providing the canopy is at risk.
'Thousand cankers disease,' the coined name for a newly discovered pathogen, is infecting and slowly killing hundreds of black walnut trees in California and seven other Western states.
The disease is caused by a previously undescribed fungus hitchhiking on a tiny bark beetle native to California and widely distributed from San Diego to Shasta counties.