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    Managing Septoria Leaf Spot of Pistachio in Arizona With Fungicides

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    Author
    Call, Robert E.
    Matheron, Michael E.
    Issue Date
    2002-11
    Keywords
    Agriculture -- Arizona
    Citrus fruits -- Arizona
    Pistachio -- Arizona
    Pistachio -- Arizona
    
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Citrus and Deciduous Fruit and Nut Research Report
    Abstract
    Septoria leaf spot was detected in the United States for the first time in 1964 within an experimental pistachio planting at Brownwood, Texas. The first observation of the same disease in Arizona pistachio trees did not occur until 1986. In 1988, a survey of the 2,000 acres of pistachio orchards in southeastern Arizona revealed a widespread incidence of the disease. Since the initial discovery of the disease, Septoria leaf spot has appeared annually in some Arizona pistachio orchards. The onset and severity of the disease is influenced by summer rainfall that occurs in this region. Pistachio trees infected with Septoria leaf spot and not treated with an effective fungicide can defoliate in the autumn up to 2 months prematurely. The objective of this field study was to evaluate the efficacy of several different fungicides against this disease. All fungicides were applied to tree foliage on June 26 and July 31, 2001. Disease severity was lowest on trees treated with Flint (trifloxystrobin) and Abound (azoxystrobin). Other materials that significantly reduced the final level of disease compared to nontreated trees included Break (propiconazole), Procop R (copper hydroxide) and Elite (tebuconazole).
    Series/Report no.
    AZ1303
    Series P-133
    Sponsors
    Arizona Citrus Research Council
    Collections
    Citrus Research Report 2002

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