Weed Control Guide for Ohio Field Crops

Preemergence plus Postemergence Soybean Herbicide Programs

Pre plus Post herbicide programs fit any field, but are especially well-suited for fields with:

• moderate to high annual grass populations
• moderate to high giant ragweed, cocklebur, and annual morningglory populations
• waterhemp and marestail
• perennial weeds
• burcucumber
• no-tillage

Advantages:

• very consistent, as long as some rain on PRE
• creates wider window for POST application, compared to total POST programs
• good on many tough weeds

Disdvantages:

• dependence upon rain for PRE activity (although have planned POST backup)
• two-pass

Approaches:

In fields with low grass populations, can take an approach of preemergence grass or grass plus broadleaf herbicide followed by postemergence broadleaf herbicide. Examples:

• Command Xtra followed by Flexstar
• Prowl followed by Pursuit + Cobra

In fields with moderate to high grass populations, can take an approach of a preemergence broadleaf herbicide that also has some grass activity followed by a postemergence grass or grass plus broadleaf herbicide treatment. Choice of preemergence herbicide would vary with type of broadleaf weeds present ­ problem weeds such as giant ragweed would require preemergence use of Canopy XL, FirstRate, or a Scepter product. Examples:

• Canopy XL followed by Flexstar plus Fusion
• Sencor followed by Synchrony STS + Select (STS soybeans)
• Boundary followed by glyphosate (RR soybeans)

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