Weed Control Guide for Ohio Field Crops

Total Postemergence Corn Herbicide Programs (without residual)

Total postemergence (POST) herbicide programs that do not provide residual control should be used primarily in fields with:

• low annual grass populations
• low to moderate annual broadleaf populations

Avoid use in fields with:

• moderate to high annual grass populations
• high broadleaf populations
• Burcucumber
• perennial broadleaf weeds (might emerge too late for control)

Advantages of total POST without residual:

• one-pass, can plant first and apply later
• not dependent upon rainfall for activity (although soil moisture status affects weed response to herbicides)

Disadvantages or total POST without residual:

• narrow window of application should be applied before weeds exceed 4 inches in height to avoid yield loss
• lack of control of weeds that emerge after application
• application too early for best perennial weed control

Approaches:
In fields with low weed pressure, can make a single postemergence application of herbicides without residual. Examples:

• Accent + Clarity
• Celebrity Plus
• Glyphosate (RR corn)
• Liberty (Liberty Link corn)

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