Growth Regulators: Oldest compounds
Symptoms:
- Distortion in plant growth
- Bending of corn, twisting of leaves
- Fusion of brace roots
- If applied too late, kills ear—no kernals, can stop the development of seed head in small grains
- Cupping in leaves upward (2, 4D)
- Cupping in leaves downward (dicamba) = “Cobra Head”