Please check this page for continuing updates on the increased tree mortality seen across the Bay Area in recent months.
An investigation into the causes of recent widespread Acacia spp. mortality in the San Francisco Bay Area – Matteo Garbelotto, UC Berkeley. Two fungi, Diaporthe and Dothiorella have been consistently isolated from acacia showing recent dieback in the San Francisco Bay Area. They both start as endophytes, living inside trees without any obvious effect on tree health, then may become pathogens with the onset of predisposing stress factors (for example, drought). This work is preliminary and ongoing. A similar study on declining Eucalyptus is starting up.
- Answers to Frequently Asked Questions
- View Grant Opportunities
- Submit reports of dead trees via Mortalitree
- Example photos below, with many more on the Photos & Videos page
- Maps, information on related science and fire prevention, and more in links further down this page
- And coming soon: pest management information, and research updates
Maps
East Bay Regional Park District map of the extent of dieback areas in the East Bay (April 2021) Download: Mapped Dieback Areas [PDF]
Scientific Information
Fungi
- Botryosphaeriaceae and Diaporthaceae in California Forest Environments by Chris Lee, CAL FIRE, August 2021
Fire Prevention
See CalFire’s Ready for Wildfire website for helpful information
Contact us
Questions and comments can be sent to bayareatreemortality@gmail.com.
 | Aerial view of dead and dying eucalyptus on East Bay Regional Park District lands. December 2020. Credit: EBRPD |
 | Dead blackwood Acacia, (Acacia melanoxylon) in the Leona Heights area, Oakland, Alameda Co., October 2020. Credit: US FS PSW |
 | Dead blackwood Acacias along Mountain Blvd in Oakland. November 2020. Credit: US FS PSW |
 | Diseased manzanita (Arctostaphylos), gray pine (Pinus sabiniana) and knobcone pine (Pinus attenuata) at Mt Diablo, Contra Costa County in March 2021. Credit: Chris Lee, CALFIRE |
