Humboldt-Del Norte

Summary of Douglas-fir Pole Beetle (Pseudohylesinus nebulosus), trees affected by them, management strategies, along with pests and pathogens with similar symptoms.

Past Forestry Workshops in Humboldt/Del Norte Counties.

UC Cooperative Extension-Humboldt/Del Norte provides general information about sudden oak death (SOD) caused by the pathogen Phytophthora ramorum. This page answers what sudden oak death is and provides information regarding disease locations and monitoring, FAQs, Guides and BMP's and Past SOD meetings.

How bark beetles cause extensive tree mortality in western forests.

Tables of Pacific Madrone (Arbutus menziesii) symptoms, possible causes, and reference photos to aid in tree disease diagnosis.

Summary of Douglas-fir Engraver Beetle (Scolytus unispinosus), trees affected by them, management strategies, along with pests and pathogens with similar display of symptoms on trees

Humboldt-Del Norte 4-H forms, applications, and scholarships

Frequently asked questions regarding sudden oak death including: What is sudden oak death or SOD? What plants are host to Phytophthora ramorum? What are the symptoms of Phytophthora ramorum? Who do I contact to learn more about regulations? Who do I contact if I suspect sudden oak death on or near my home or…

The effect of sudden oak death on tanoaks and coast live oak trees.

Find food preservation tips for canning, freezing, dehydrating, and keeping food safe.