Subtropical Fruit Crops Research & Education
University of California
Subtropical Fruit Crops Research & Education

We are San Diego & Riverside County Farm Advisors

Topics in Subtropics Blog

  • Shoot and Twig Dieback of Citrus

    Added March 22, 2017
    branch dieback on clementine

    Recently, an outbreak of shoot and twig dieback disease of citrus has been occurring in the main citrus growing regions of the Central Valley of California (Fig 1). The causal agents of this disease were identified as species of Colletotrichum, which are...

  • Resistant Citrus Selections to HLB?

    Added March 20, 2017
    HLB resistant variety

    Three citrus trees that produce inedible fruit at the UC Lindcove Research and Extension Center in Visalia may be a game-changer for the citrus industry, reported Ezra David Romero on Valley Public Radio. The trees are thought to be resistant...

  • California State Soil - San Joaquin Series

    Added March 17, 2017

    Many states have a designated state bird, flower, fossil, mineral, etc. In California, the state bird is the California Valley Quail, the state flower is the Golden Poppy, the state fossil is the Sabertoothed Cat, and the state mineral is Native Gold....


    Added March 15, 2017
    c 50

    The rootstocks ‘Bitters', ‘Carpenter' and ‘Furr citrandarins were developed at the USDA Date and Citrus Station in Indio, California. Having mandarin genetics with different horticultural properties and being more tolerant of calcareous...

  • HLB Immunity, Resistance and Tolerance

    Added March 13, 2017
    HLB leaves starch

    Citrus huanglongbing (HLB) is a destructive disease with no known cure. To identify sources of (HLB) resistance in the subfamily Aurantioideae to which citrus belongs, we conducted a six-year field trial under natural disease challenge conditions in an...

  • New Topics in Subtropics Newsletter

    Added March 8, 2017

    Topics in Subtropics View List of Newsletter Issues | Return to Topics in Subtropics   January - March Topics in Subtropics 2017 In this issue: Revisiting an old study on high density citrus orchards Shoot and Twig...

Avocado Production in California Books

Book 1: Background Information

In Book 1, Gary S. Bender, Farm Advisor, takes you through the history of the avocado industry in California and teaches you about grove development.

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Book 2: Cultural Care

Book 2 focuses on cultural care and includes articles on irrigation, fertilization, disease and insect control, vertebrate pest management, pruning and frost management. The author for most of the articles is Gary S. Bender, Farm Advisor for Subtropical Horticulture in San Diego County.

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