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.

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	5^th 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	3^rd 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