Controlled Release Fertilizer (CRF) is an effective way to reduce the
    effects of HLB infection in many commercial varieties of citrus.  In our
    test plot, the trees have not been treated with foliar sprays of any kind
    for at least 3 growing seasons.  This format allows us to derive
    conclusions about the effects of CRF, and the natural tolerance of
    varieties to HLB.  The following videos and pictures show the status of
    the planting as of July 2016.
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    Arapaho Citrus Controlled Release Fertilizer Planting Video
    Videos - Tolerance to HLB of Various Citrus Varieties with CRF
Valencias 9/12/2015
No Spray 2 Years
Same Valencias 8/2/2016
No Spray 3 Years
Psyllid Population in Block Receiving Spray
Program, in active CHMA
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Psyllids in Unsprayed Trees.  Note Tamarixia
radiata, released during flush
August 2016 - Navels on Sour Orange in Weirsdale after 7 months on
Controlled Release Fertilizer program.  Trees were declining from
HLB.  Only one PFD spray and one Summer Oil this season.
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    Arapaho Citrus Controlled Release Fertilizer Program Comparison

    See a comparison of CRF and Conventional Source Fertilizer Programs,
    including costs, rates, and formulations - Click Here....