Illinois Soybeans: Preharvest Intervals for Postemergence Herbicides

    Almost all postemergence soybean herbicides have a preharvest interval or a soybean developmental stage beyond which applications cannot be made specified on their respective label. 

    Labels of some products may indicate both a developmental stage (before soybean bloom, for example) and a preharvest interval.  Preharvest intervals indicate the amount of time that must elapse between the herbicide application and crop harvest.

    Failure to observe the preharvest interval may result in herbicide residue levels in the crop in excess of established limits.

    Table 1 contains information regarding preharvest intervals for a number of postemergence soybean herbicides.

    Herbicide Preharvest Interval/Maximum Soybean Growth Stage
    Assure II/Targa 80 days
    Anthem Maxx/Cadet 60 days
    Basagran No interval on label
    Classic 60 days
    Cobra/Phoenix 45 days/do not apply after R6
    Dual Magnum1/Dual II Magnum1 90 days/through third trifoliolate
    Enlist Duo Do not apply after R2
    Extreme/Tackle 85 days
    FirstRate Apply prior to R2
    Flexstar/Rhythm 45 days
    Flexstar GT 45 days
    Fusilade DX 60 days
    Fusion Prebloom
    Liberty/Interline/Cheetah/Cheetah Max 70 days
    Roundup PowerMax2 Broadcast: through R2Harvest aid: 14 days
    Harmony SG 60 days
    Marvel 60 days
    Outlook1 5th trifoliolate
    Poast/Poast Plus 75 days
    Prefix/Vise 90 days
    Pursuit 85 days
    Raptor Prebloom
    Resource 60 days
    Select or SelectMax 60 days
    Storm 50 days
    Synchrony XP 60 days
    Torment 85 days
    Ultra Blazer 50 days
    Warrant1/Warrant Ultra Before R2
    Zidua1 3rd trifoliolate

     1These products will not control emerged weeds but can be applied postemergence for soil-residual weed control.

    2Data, taken from the Roundup PowerMax label, are for broadcast applications in glyphosate-resistant soybean varieties.  Intervals change for applications (spot treatment and preharvest) made to non-glyphosate-resistant soybean varieties.

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