Plant Diseases

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Rows of tomato plants in a field.
UC Ag Experts Talk Webinar Series: Event

Webinar: Using Trichoderma Biocontrols to Manage Soil Fungal Pathogens and Productivity for Vegetables

Event Date
Sep 16, 2026

This webinar is part of the UC Ag Experts Talk series. Dr. Zheng Wang, University of California Cooperative Extension in Stanislaus County, will cover information on effective use of Trichoderma-containing biofungicides for preventative measurements toward soil fungal pathogens mainly in processing tomatoes…
UC Ag Experts Talk Webinar Series
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Pink and white roses surrounded by green leaves.
Urban & Community IPM Webinars: Event

Rose Cultural Practices, Abiotic Disorders and Diseases

Event Date
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

Event Date
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

Event Date
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

Event Date
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

Event Date
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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Text reads "Pest Tips for July". In the background you see a picture of a summer garden, abundant with flowers and fruit trees.
Pests in the Urban Landscape: Article

July Pest Management Tips

July 1, 2026
By Yulie Velez
Summer is in full force and while it's been quite hot in many parts of California, it's been very cool in others. That's why UC IPM's Seasonal Landscape IPM Checklist is a useful tool to help you figure out what to do in your region each month! Here are some general tips for keeping your landscape…
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Ripe red tomatoes with rough uneven discolored surfaces next to a green tomato surrounded by browning green leaves near the ground. Copyright information is at the bottom

Vegetable Garden Diseases and Disorders

June 17, 2026
By Mackenzie F Patton
When you have a vegetable garden, sometimes you might discover your plants aren’t growing as well as expected and look sick. Vegetable plants can get diseases just like animals. A plant disease is an abnormal condition caused by microorganisms such as bacteria, fungi, water molds, or viruses. These are known…
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