Plant Diseases

Pink and white roses surrounded by green leaves.
Urban & Community IPM Webinars: Event

Rose Cultural Practices, Abiotic Disorders and Diseases

Aug 20, 2026

In this webinar we will review aspects related to growth of outdoor rose plants, including cultural practices such as fertilization and weed control.
Urban & Community IPM Webinars
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Three leaves with large, yellow-orange blotches that turn reddish-brown in their center
UC Ag Experts Talk Webinar Series: Event

UC Ag Experts Talk: Epidemiology and Control of the Invasive Red Leaf Blotch Disease of Almond

Feb 18, 2026

This webinar is part of the UC Ag Experts Talk series. Dr. Florent Trouillas, Associate Cooperative Extension Specialist with the Department of Plant Pathology at UC Davis and the Kearney Agricultural Research and Extension Center, will go over the main symptoms of red leaf blotch disease in almond including…
UC Ag Experts Talk Webinar Series
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Irregular red or reddish-purple blotches on grape leaves, starting at the base of the shoots and progressing upward.
UC Ag Experts Talk Webinar Series: Event

Webinar: In-house Diagnostics for Disease Management: LAMP for Red Blotch Detection in Grapevines

Nov 12, 2025

This webinar is part of the UC Ag Experts Talk series. Dr. Monica Cooper, Viticulture Farm Advisor with the University of California Cooperative Extension, Napa County, will give an introduction to grapevine red blotch virus (GRBV) including its ecology, physiological impacts, symptoms, and management. She…
UC Ag Experts Talk Webinar Series
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Small pink and translucent mite with eight legs, four stretched to the front and four stretched back, on a pale orange surface.
UC Ag Experts Talk Webinar Series: Event

Webinar: Citrus Leprosis Threat, Mites, and Mite Management

Aug 27, 2025

Presenters: Dr. Sandipa Gautam, Cooperative Extension Area Citrus IPM Advisor, UC Agriculture and Natural Resources; Dr. Kris Godfrey, Project Scientist, Contained Research Facility, UC Davis; Dr. Daniel Carrillo, Assistant Professor, Entomology & Nematology Department, University of Florida; Tera Pitman…
UC Ag Experts Talk Webinar Series
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Green alfalfa field with scattered blooms of purple flowers blowing in the wind.
UC Ag Experts Talk Webinar Series: Event

Webinar: Pest Management in Alfalfa, Small Grains, and Garbanzo Beans

Sep 24, 2025

This webinar is part of the UC Ag Experts Talk series. Dr. Michelle Leinfelder-Miles, Delta Crops Resource Management Advisor with the University of California Cooperative Extension, San Joaquin County, will discuss the principles of Integrated Pest Management and pest management in alfalfa, small grains,…
UC Ag Experts Talk Webinar Series
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Pruning out old roses with bypass pruners.
Pests in the Urban Landscape: Article

Jump into Summer with these IPM Webinars!

May 21, 2026
By Yulie Velez
Looking to keep your brain stimulated this summer? Need information about garden pests? Join us every third Thursday of the month from 12:00 to 1:00pm PST to learn about a wide range of urban pest management topics. This series is free and open to the public, but advance registration is …
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Black, wilted blossoms affected by fire blight on a fruit tree.
Pests in the Urban Landscape: Article

Look Out for Fire Blight!

May 6, 2026
By Belinda Messenger-Sikes
A warm March followed by rain in April and May in many parts of California has set up the perfect conditions for the development of an unsightly and damaging tree disease called fire blight. Pome fruit trees like pear and apple, and other related trees like pyracantha, are all susceptible to this bacterial…
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Fire blight inhibits fruit development on pear. J. Alosi
The Real Dirt: Article

It’s Fire Blight Season!

April 1, 2026
If you are noticing droopy, dried-out flower clusters on your pears, Asian pears, quince, apples or crabapples, fire blight may be the cause. Fire blight is caused by a bacterium and is a common and frequently destructive disease that usually shows up in April and May, but during dry spell, it may appear in…
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The green foliage of a small sycamore tree coated with fluffly, white patches of powdery mildew fungus.
Pests in the Urban Landscape: Article

What's That Powdery Stuff on My Plants?

March 5, 2026
By Belinda Messenger-Sikes
Have you seen white powdery-looking patches appearing on the leaves of your roses or sycamore trees? While home gardeners may be familiar with this sign of the plant disease powdery mildew on their veggies, ornamental plants and landscape trees can also be infected. In addition to those powdery spots, the…
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