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  • (Public Value) UCANR: Protecting California's natural resources
UCANR: Protecting California's natural resources
Invasive Shothole Borers – An Ongoing Threat to California’s Trees
Published on: August 9, 2021
A small black brown beetle in a tunnel gallery in a piece of wood.
Figure 1. Polyphagous shothole borer in its gallery. (Credit: J Kabashima, UCCE)

Two identical looking species of wood-boring beetles, collectively known as invasive shothole borers (ISHB), have killed thousands of trees in Southern California and pose an ongoing threat to California's urban and wildland forests. These beetles, which are not native to the United States, were first identified in Los Angeles County in 2012 and have since spread to six other counties: Orange, Riverside, San Bernardino, San Diego, Santa Barbara, and Ventura.

Beetles, Fungus, and Impact

The polyphagous shothole borer (Euwallacea fornicatus) (Figure 1) and the Kuroshio shothole borer (Euwallacea kuroshio) are small ambrosia beetles that have a symbiotic relationship with several species...

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Public Value: UCANR: Protecting California's natural resources
Tags: beetle (14), control (58), disease (46), fungus (6), Green Bulletin (7), invasive (47), invasive species (9), landscape (53), Nobua-Behrmann (2), Oliver (1), pest (110), pest management (90), shot hole borer (2), tree (21), UC IPM (305)
Focus Area Tags: Natural Resources, Pest Management, Yard & Garden
Comments: 1
UCANR: Protecting California's natural resources
Summertime California Ground Squirrel Management
Published on: August 4, 2021
A California ground squirrel on dirt.
Figure 1. A California ground squirrel. (Credit: M Dimson, UCCE)
Summer is upon us so what does that mean for California ground squirrel management? As a practitioner of IPM, you are likely aware that effective ground squirrel management requires an integrated approach, including knowledge of pest biology. Ground squirrel behavior, which impacts the effectiveness of different management tools, is significantly affected by the season. Now that we are in summer, the soil is dry and the California ground squirrel (Figure 1) diet has likely switched from green vegetation to seeds. During this season, fumigation, which requires moist soil, will be much less effective, but trapping and toxic baits may still be effective.
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Public Value: UCANR: Protecting California's natural resources
Tags: bait (6), Green Bulletin (7), ground squirrel (9), label (10), pest (110), pest management (90), Pest Notes (103), pesticide safety (16), Quinn (15), rodenticide (7), traps (9), UC IPM (305), vertebrate (5), Whitesell (1)
Focus Area Tags: Environment, Natural Resources, Pest Management, Yard & Garden
Comments: 0
UCANR: Protecting California's natural resources
New WeedCUT online tool to manage invasive weeds in wildlands without herbicides
Published on: July 6, 2021
Santa Monica Mountains BAR team holding tools to manage invasive weeds using non-chemical approaches.
Santa Monica Mountains BAR team holding tools to manage invasive weeds using non-chemical approaches.

California has abundant wildlands — forests, rangeland, open areas, wildlife refuges and national, state, and local parks — that need protection from invasive plants. Invasive plants affect all Californians by increasing wildfire potential; reducing water resources; accelerating erosion and flooding; threatening wildlife; degrading range, crop and timberland; and diminishing outdoor recreation opportunities. According to the California Invasive Plant Council (Cal-IPC), more than 200 identified plant species harm California's wildlands.

Cal-IPC and the University of California...

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Public Value: UCANR: Protecting California's natural resources
Tags: CalIPC (1), invasive (47), martin (2), nonchemical (3), resources (6), weed prevention (4), weed science (6), weeds (31)
Focus Area Tags: Environment, Innovation, Natural Resources, Pest Management
Comments: 0
UCANR: Protecting California's natural resources
Invasive Species Action Week 2021
Published on: June 6, 2021
Adult insect with pinkish wings that have black patterning and dots resting on bark.
Sideview of adult spotted lanternfly. (Photo courtesy of Bugwood)

California Invasive Species Action Week began Saturday, June 5 and runs through Sunday, June 13, 2021. Increasing public awareness of invasive species and their impacts helps protect our natural resources, waterways, native species, agriculture, and health.

UC IPM has several resources on exotic and invasive species as well as information on specific pests both present in California as well as pests that have a high...

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Public Value: UCANR: Protecting California's natural resources
Tags: California Department Fish and Wildlife (2), California Department of Food and Agriculture (2), CFDA (1), invasive (47), invasive species (9), invasive species action week (6), pest management (90), UC IPM (305)
Focus Area Tags: Environment, Natural Resources, Pest Management, Yard & Garden
Comments: 0
UCANR: Protecting California's natural resources
Storm Damage in Landscapes
Published on: January 27, 2021
Downed tree with exposed roots in front of residence.
Downed tree with exposed roots in front of residence. (Credit: I Gonzalez)
Strong winds from the latest winter storm have downed trees and branches throughout Northern California and may have also damaged plants in your garden and landscape. Further damage from wind or hail can be reduced with proper cultural care. See our website for more information on environmental disorders such as wind damage, wind injury to tree fruits and nuts, and
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Public Value: UCANR: Protecting California's natural resources
Focus Area Tags: Pest Management, Yard & Garden
Comments: 0
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