Topics in Subtropics

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Topics in Subtropics Blog
You can subscribe to this  blog with multiple entries per week reflecting what's happening with subtropical crops and upcoming educational events.  Just click on the "Subscribe" button just to the right of this paragraph.  There's also our seasonal quarterly Topics in Subtropics newsletter found at our Ventura, Santa Barbara, San Luis Obispo, Riverside, San Diego, Tulare and Kern Counties Cooperative Extension websites.

Avocado Collapse!!!!!!!

January 16, 2026
By Ben A Faber
It's that time of year to see some drama in avocado orchards. Once healthy-looking trees can suddenly turn brown in a weekend and all the surrounding trees still look fine. And it can be quite common in some years along the coast. The winter weather will have mild, cool even rainy days and then suddenly…
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HLB Leaf

HLB Quarantine Expands into Commercial Citrus

January 15, 2026
By Ben A Faber
Agriculture officials have expanded the areas quarantined for citrus greening disease (known as huanglongbing or HLB) in California. The quarantined area in the Corona area of Riverside County was expanded by 37 square miles. The San Juan Capistrano quarantined area of Orange County was expanded by 18 square…
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ALB defoliation

Association of Applied IPM Ecologists Annual Meeting

January 12, 2026
By Sandipa Gautam
Don’t miss the Association of Applied IPM Ecologists Annual Conference, February 5–6 in Modesto, CA. Join IPM professionals, researchers, and pest control advisors for two days of engaging presentations and discussions focused on today’s most pressing pest management challenges. The program features…
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Climate Change Workshop

January 9, 2026
By Ben A Faber
Climate And Agriculture: Farming in a Changing Climate WorkshopWhen: Tuesday January 20, 2026Time: 8:30 - 2:30 (lunch will be provided)Where: Ventura County Community Foundation, 4001 Mission Oaks Blvd, Suite A, Camarillo, CARegistration: https://bit.ly/ClimateAndAgVC UC ANR CLIMATE AND…
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asphyxiated tree white washed

With Rain, Mulch is Bad and Weeds are Good?

January 8, 2026
By Ben A Faber
Rain is wonderful stuff. If it comes and washes the accumulated salts of the last several years out of the root zones of citrus and avocado, that's a good thing. But what happens if there is a little too much of the good stuff? In the winter of 2005, Venture got over 40” of rain, which is 200% of what is…
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