Tree Mortality
John Osbourn, Director of OES
Technical Questions: Dr. Richard Harris

MAILING ADDRESS:
891 Mountain Ranch Road
San Andreas, CA 95249
Mon - Fri: 8am - 5pm
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CONTACT DR. HARRIS:
PHONE: (707) 685-5508
Email Dr. Harris

Closed Weekends & Holidays

Items of Interest

Signs of a new tree mortality event showing up in the Sierra Nevada 15 November 2022

Signs of a new tree mortality event showing up in the Sierra Nevada

Nov 9, 2022 | Regional Updates

2021 Highlights of Tree Mortality from Insects & Diseases 2 March 2022

2021 Highlights of Tree Mortality from Insects & Diseases

Aerial Detection Surveys 2 March 2022

Aerial Detection Surveys

Areas with Tree Mortality from Bark Beetles 15 June 2020

Areas with Tree Mortality from Bark Beetles

Summary for 2000 - 2020, Western US

Bark Beetles 5 February 2020

Bark Beetles

Beetle life cycle, are your trees susceptible, controlling beetles in firewood and managing beetles in trees.

Dead Trees Fuel Wildfire Severity in Sierra Nevada 14 January 2021

Dead Trees Fuel Wildfire Severity in Sierra Nevada

Study highlights the role of forest fuels amid a warming climate.

Frequently Asked Questions 5 February 2020

Frequently Asked Questions

Tree mortality and bark beetle FAQ's.

Projects Defined 4 October 2021

Projects Defined

View the new project areas here. 

Tree Removal 5 February 2020

Tree Removal

Professional foresters and tree services companies.

Press & Alerts

15 November 2022

Tree Mortality Program Press Release

Emergency Alerts 5 February 2020

Emergency Alerts

Sign-up for the Calaveras County Emergency Alerts.

What's New 5 February 2020

What's New

Information and Press Releases.