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    Evaluation of Fungicide Rotations for Control of Powdery Mildew of Cantaloupe

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    Author
    Olsen, M. W.
    Rasmussen, S.
    Issue Date
    2001-08
    Keywords
    Agriculture -- Arizona
    Vegetables -- Arizona
    Vegetables -- Plant pathogens
    
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    Publisher
    College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ)
    Journal
    Vegetable Report
    Abstract
    A fungicide trial was established at The University of Arizona Marana Agricultural Center in April 2000 to evaluate rotation and timing of application for several fungicides used for control of powdery mildew on cantaloupe. Treatments included seven registered fungicides: azoxystrobin, micronized sulfur, neem extract, potassium bicarbonate, benomyl, thiophanate methyl and trifloxystrobin. Different rotations and timing of application of these fungicides were applied either before or immediately after initial signs of powdery mildew infection and up to three times thereafter depending on rotation scheme. By the second application, disease severity was mild but increased rapidly, and it was severe by the time of the last application. Powdery mildew was controlled to some degree on the upper leaf surface by all treatments. However, efficacy was more variable on the lower leaf surface and was reduced when applications were made only at dates 1 and 2. Results show the increased efficacy of fungicides with systemic or trans-laminar activity and the possibilities of rotations with contact fungicides for resistance management.
    Series/Report no.
    AZ1252
    Series P-127
    Collections
    Vegetable Report 2001

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