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May 2025Archived

 

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UC Master Gardeners of Humboldt & Del Norte Counties: Page

Composting

Why Compost? Handful of Compost It is nature's way to turn fruit, vegetable, and yard trimmings into soil amendment. Benefits the environment by recycling organic resources and extending the life of landfills. Improves water holding capacity of soil, and helps prevent water runoff and erosion.
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UC Master Gardeners of Humboldt & Del Norte Counties: Page

Plums

Plum trees can be grown almost anywhere in California. They are easy to grow. Most plums require cross pollination. There are two basic kinds of plums: Japanese (Prunus salicina) and European (Prunus domestica). Both require 140-170 days to mature the crop.
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UC Master Gardeners of Humboldt & Del Norte Counties: Page

Jumping Worm

The jumping worm, Amynthas agrestis, is an invasive earthworm that has been recently reported in a yard in Arcata. The local extent of this invasive organism is currently unknown. It is typically introduced and spread via potted plants, potting mixes, or mulch.
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UC Master Gardeners of Humboldt & Del Norte Counties: Page

Pierce's Disease

Pierce's disease is a disease of grapes caused when the bacterium Xylella fastidiosa colonizes the water-conducting system (the xylem) of the host plant and creates a significant blockage. It is spread from plant to plant by sap-feeding insects, such as sharpshooters and spittlebugs.
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Mediterranean Oak Borer: Page

News and Events

Under the Hood: The Silent Invasion The Mediterranean Oak Borers Threat Grows by Tim Carl, Napa Valley Features, 2/1/2025 Mediterranean oak borers detected in Lake, Napa, Sonoma counties Morning Ag Clips, 8/6/2020 Attention to oak woodland conservation does not wane amid COVID-19 crisis by UC ANR,...
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Mediterranean Oak Borer: Page

Pest Overview

The Beetle Learn more about the Mediterranean Oak Borer The Disease Learn more about the pathogenic fungi behind the disease Host Trees MOB attacks at least 12 species of oak Distribution MOB has been found in Amador, El Dorado, Lake, Marin, Mendocino, Sacramento, Sonoma and Yolo Counties Counties Impact MOB…
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Mediterranean Oak Borer: Page

Diagnosis & Management

Signs & Symptoms Identifying the presence of MOB infestations Look-alikes Other pests with similar symptoms Waste Disposal How to handle infested wood and green waste Reporting How to report an infested tree...
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Mediterranean Oak Borer: Page

Resources

Pest Alert in Spanish, August 2021 Pest Alert, July 2020 Establishment of a non-native xyleborine ambrosia beetle, Xyleborous monographus (Fabricius) Coleoptera: Curculionidae Scolytinae), new to North America in California, June 2020 Reducing the Spread of Invasive Pests in Cut Wood, UC IPM Green B...
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Mediterranean Oak Borer: Page

About the Beetles

The Mediterranean oak borer (MOB) is an ambrosia beetle native to the Mediterranean region, including Europe, the Middle East, and North Africa, where it primarily attacks oak species.
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