Timeframe for applying postemergence soybean herbicides

Timeframe for applying 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.  Aaron Hager at University of Illinois has gathered soybean herbicide application information regarding preharvest intervals.

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

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

2 Data, 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.

 

Originally posted by University of Illinois.

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