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    Effect of Powdery Mildew on Pecan Nut Weight and Quality

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    Author
    Olsen, M.
    Rasmussen, S.
    Nischwitz, C.
    Kilby, M.
    Issue Date
    2000-10
    Keywords
    Agriculture -- Arizona
    Citrus fruits -- Arizona
    Pecan -- Arizona
    Pecan -- Diseases
    
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Citrus and Deciduous Fruit and Nut Research Report
    Abstract
    Powdery mildew of pecan, caused by Microsphaera ulni, results in discoloration of pecan shucks, but its effects on yield and quality of kernels are not known. In 1999, powdery mildew was observed on pecan shucks by the latter part of June in a commercial pecan orchard near Sahuarita, Arizona. The fungus continued to be active throughout the summer. However, results of a field test comparing diseased and healthy nuts from two varieties of pecans indicate that powdery mildew did not affect nut weight or quality. Whole nut weights, kernel weights, color ratings or percentage of discarded nuts were not significant between paired clusters of nuts that were treated with fungicides and remained disease free and untreated nuts that were infected with powdery mildew. Although shucks may have a high percentage of area covered by powdery mildew, results from this trial indicate that fungicide treatments are not warranted.
    Series/Report no.
    AZ1178
    Series P-123
    Collections
    Citrus Research Report 2000

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