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    Timing of Postemergence Herbicides for Onion Weed Control

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    Author
    Umeda, K.
    Gal, G.
    Strickland, B.
    Issue Date
    1999-10
    Keywords
    Agriculture -- Arizona
    Vegetables -- Arizona
    Vegetables -- Herbicides
    
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Vegetable: A College of Agriculture Report
    Abstract
    Bromoxynil (Buctril®) at 0.063, 0.094, and 0.125 lb AI/A was completely safe on onions treated at the early first true leaf stage of growth. Onions did not exhibit visual injury at 12 days after treatment (DAT) and height was not different from the untreated at 45 DAT. Melilotus officinalis (yellow sweetclover) was only marginally controlled by both Buctril and oxyfluorfen (Goal®). Goal provided better weed control with an earlier application timing at 0.063 lb AI/A than the later application at 0.25 lb AI/A. All herbicide treated onions yielded higher than the untreated. A rate response was observed for Buctril and Goal where onion yields were higher for the higher rates of application. Results indicate that the POST herbicides at lower than typical use rates were safe when applied to onions at an early timing. Effective weed control of some weeds was observed but yellow sweetclover was not adequately controlled.
    Series/Report no.
    AZ1143
    Series P-118
    Collections
    Vegetable Report 1999

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