Preharvest Intervals For Postemergence Soybean Herbicides

Jun 29, 2016

By Aaron Hager

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.

HerbicidePreharvest Interval/Maximum Soybean Growth Stage
Assure II/Targa80 days
Anthem Maxx/Cadet60 days
BasagranNo interval on label
Classic60 days
Cobra/Phoenix45 days/do not apply after R6
Dual Magnum1/Dual II Magnum190 days/through third trifoliolate
Enlist DuoDo not apply after R2
Extreme/Tackle85 days
FirstRateApply prior to R2
Flexstar/Rhythm45 days
Flexstar GT45 days
Fusilade DX60 days
FusionPrebloom
Liberty/Interline/Cheetah/Cheetah Max70 days
Roundup PowerMax2Broadcast: through R2

Harvest aid: 14 days

Harmony SG60 days
Marvel60 days
Outlook15th trifoliolate
Poast/Poast Plus75 days
Prefix/Vise90 days
Pursuit85 days
RaptorPrebloom
Resource60 days
Select or SelectMax60 days
Storm50 days
Synchrony XP60 days
Torment85 days
Ultra Blazer50 days
Warrant1/Warrant UltraBefore R2
Zidua13rd 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.

Source:.illinois.edu

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