Abiotic in-crop constraints for wheat


Group I herbicide damage

Constraint – Group I herbicide damage


  • 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


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


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.