Posted on Jun 28, 2016 by Aaron Hager

Preharvest Intervals for Postemergence Soybean 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 R2

Harvest 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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