Group I herbicide damage

Constraint – Group I herbicide damage

Symptoms

• Foliar symptoms appear within 3-4 days of application
• Susceptible plants start to twist and appear distorted
• Very early sprayed plants have a fused flag leaf that resembles an onion leaf
• Late sprayed plants may develop head deformation

Damage

• Distorted heads may contain less grain, leading to yield decreases

Control

There are no treatment options. As a precaution, spray when the risk of drift is low, and in optimum environmental conditions.

Links and Resources

DAFWA - Group I herbicide damage Introduction, what to look for on plant and in paddock, what else could it be, and treatment.

DEPI VIC - Group I herbicide Information on residual herbicide presence, which herbicides are residual, how herbicides break down, and avoidance methods. Page last updated 2013.