Pests & Diseases

Tomato Pests and Diseases
UC Master Gardeners of Orange County: Event

Tomato Pests and Diseases-Laguna Beach

Jun 21, 2025

The best thing about growing tomatoes – their wonderful flavor. The worst? Pests, diseases and environmental threats.  In this presentation, UC Master Gardeners of Orange County will examine those and provide general control methods, including crop rotation, planting/watering, choosing disease resistant…
UC Master Gardeners of Orange County
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Valley oak tree atop a hill of brown grass.
Urban & Community IPM Webinars: Event

Webinar: Mediterranean Oak Borer & Other Pests of California Oaks

Apr 10, 2025

The Mediterranean Oak Borer (MOB) is an invasive ambrosia beetle that infests several species of white oaks in California: valley oak, blue oak, and Oregon oak. The beetle is spreading rapidly in Napa, Lake, Sonoma, and Sacramento Counties and has been detected in neighboring El Dorado, Yolo, and Mendocino…
Urban & Community IPM Webinars
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Small pink and white waxy insects feeding on young citrus fruit.
UC Ag Experts Talk Webinar Series: Event

UC Ag Experts Talk: Mealybug Management in Citrus Orchards in California

May 21, 2025

In this webinar, Dr. Sandipa Gautam, Cooperative Extension Area Citrus IPM Advisor with the University of California Agriculture and Natural Resources at the Lindcove Research and Extension Center, will discuss citrus mealybug and how it has become a pest of concern for citrus growers in California in recent…
UC Ag Experts Talk Webinar Series
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Small moth-like insect with wings broadest in the apical half, mottled, and have a dark brown band around the outer half laying yellow almond shaped eggs on green leaves.

Asian Citrus Psyllid: Webinar Q&A

August 21, 2026
By Yulie Velez
Following the July 16th webinar Update on Asian Citrus Psyllid in California, our presenter, Dr. Sandipa Gautam, answered live questions from participants. Below are some of the questions asked about Asian citrus psyllid (ACP) and Huanglongbing (HLB) disease. Keep in mind that some of the questions were…
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SoCal Desert Plant Pathology: Article

Onion Downy Mildew Fungicide Efficacy Trial - 2025/26

August 13, 2026
By Ana Maria Pastrana Leon
A fungicide efficacy trial was conducted at the Emerald Seed Co. research farm in El Centro, CA, from September 2025 to March 2026 to evaluate the effectiveness of various fungicide treatments against onion downy mildew (Peronospora destructor) under field conditions. The trial included 9 treatments across 4…
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August pest tips

August Pest Management Tips

August 11, 2026
By Yulie Velez
Follow these tips for the month of August to prevent pests in your garden and landscapes. To see tips more specific to your region, visit the Seasonal Landscape IPM Checklist on the UC IPM website.  Manage ants around landscapes and building foundations using insecticide baits and trunk barriers…
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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
Pests in the Urban Landscape: Article

Common 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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