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    Reaction of Different Cultivars of Lettuce to Development of Powdery Mildew on Lettuce in 2001

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    Author
    Matheron, Michael E.
    Porchas, Martin
    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
    Seven different cultivars of lettuce were seeded and watered on Dec 1, 2000 at the Yuma Valley Agricultural Center. Cultivars were rated for severity of powdery mildew caused by Erysiphe cichoracearum at plant maturity (Mar 21). The highest levels of powdery mildew were found on the cultivars Winterhaven and Silverado, whereas lower disease severity was observed on Jackel, Cibola, RC-74 and Accolade. All tested cultivars would have required application of fungicides to reduce the amount of powdery mildew to acceptable levels. On the other hand, planting of lettuce cultivars with some disease tolerance may require less fungicide inputs to achieve acceptable disease control compared to planting susceptible cultivars.
    Series/Report no.
    AZ1252
    Series P-127
    Collections
    Vegetable Report 2001

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