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.
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Apple

Fruit Tree Course in Beautiful Davis, CA

January 7, 2026
By Ben A Faber
A fruit tree is not a basil plant or a geranium.  It's a tree, and not only that it's a fruit tree.  Learn the basics and the intricacies of growing fruit trees of all kinds.  Sign up for a wild journey.Please join us for the 2026 Principles of Fruit and Nut Tree Growth, Cropping, and…
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Watch OUT for Brown Rot

January 6, 2026
This is the recent newsletter from the Ojai Pixie Tangerine Growers Association.  Emily Ayala is the author.  I thought this is a great wake up call for ALL Citrus Growers with all the rain we have had and will have.  Get that copper on. Ben Happy New Year! Well, we've got the rain…
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Honey Bee Working an Avocado Flower

2025 Honey Bee Colony Losses

December 23, 2025
2025 has been a rough year for the honey bees and their keepers. Reports of extreme colony mortality began in January, just before the almond bloom which requires the pollination services of an estimated 1.5 million colonies (Fenton, et al., 2025). As of July, honey bee colonies have reportedly dwindled by…
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fruit fly

Is that a Fruit Fly?

December 23, 2025
By Bodil N Cass
I was in a citrus orchard in San Diego recently with some colleagues, looking for sap-sucking hemipterans to run an experiment. I kept getting distracted, however, by some small flies. They were shiny, bright yellow with black stripes, like a miniature, polished hoverfly. Every tree I inspected in this…
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avo flower

Role of Pollinators in Avocado Production

December 23, 2025
By Hamutahl Cohen
Avocado pollination is a little-understood process influenced by flower biology, environmental conditions, and pollinator behavior. Our study from UC Cooperative Extension and UC Davis aims to shed light on the complexity of avocado pollination and the role of various insect species in enhancing fruit set…
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