Ohio State University Extension/Research

Weed Control Guide for Ohio Field Crops

Corn: Soil-Applied Herbicides Preplant or Preemergence

Herbicide Formulation Product Rate Range

Bicep II Magnum 5.5L 1.3 - 2.6 qt

Bicep II is a premix of metolachlor (Dual II Magnum) plus atrazine for annual grass and broadleaf control.
Mode of action: photosynthesis inhibitor (atrazine), shoot meristem inhibitor (metolachlor).
May be applied up to 30 days before planting as a single application. When applying 30 to 45 days before planting, apply 2/3 full rate early, followed by 1/3 full rate at planting. Rates increase somewhat when applied early, compared to application at planting.
Bicep II may be applied preplant, preemergence, and after corn emergence until corn plants are 5 inches tall and before weeds exceed the 2-leaf stage. Do not apply in liquid fertilizer after the crop emerges.

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Keith L. Smith, Associate Vice President for Ag. Adm. and Director, OSU Extension.

TDD No. 800-589-8292 (Ohio only) or 614-292-1868

Herbicide	Formulation	Product Rate Range
Bicep II Magnum	5.5L	1.3 - 2.6 qt