Zeagran 340, SE

Technical Profile: Zeagran 340, SE

Effective weed management in corn crops relies on a precise balance between systemic activity and crop selectivity. Zeagran 340, SE, manufactured by Nufarm Australia Ltd., achieves this through a dual-action formula containing terbuthylazine (a triazine) and bromoxynil. This combination blocks critical metabolic pathways, ensuring not just temporary suppression but the destruction of target weeds.

The Advantage of Suspension Emulsion

The choice of suspension emulsion (SE) as the delivery vehicle is deliberate. Unlike standard emulsifiable concentrates, SE provides superior stability and uniform coverage across the leaf surface. This is vital for post-emergence application, ensuring that tough species like common lambsquarters, redroot pigweed, and common ragweed are fully covered despite varying field conditions.

Mechanism of Action

• Systemic Control: Terbuthylazine penetrates the plant, inhibiting electron transport during photosynthesis. The result is a rapid halt in weed development within hours.
• Contact Effect: Bromoxynil delivers a burn-down effect on broadleaf weeds, which is particularly effective against black nightshade and knotweed.
• Selectivity: Engineered for crop safety, Zeagran allows the corn plant to metabolize the active ingredients, ensuring the herbicide targets weeds while leaving the crop unharmed.

The label specifies a single application rate of 1–1.5 L/ha. When applied during the active growth phase of weeds, the systemic nature of Zeagran 340, SE makes it an essential tool for high-efficiency, one-pass weed control programs.