Broad constraint resources are outlined in the Agronomists Toolkit. Specific constraint categories are listed below:


Group A herbicide damage

Constraint - Group A herbicide damage


  • Mildly damaged vegetative stage plants are dark green and cupped downwards with minor leaf spotting and scorching

  • Flowering plants are smaller and produce fewer and smaller flowering spikes

  • Flowers may appear distorted, resulting in distorted heads, and reduced and distorted pods 


  • Generally canola is not damaged/recovers from damage by this herbicide group, but Dims can cause damage and yield loss


There is no treatment options. Plants will either recover or suffer damage. Management options include spraying when the risk of drift is low and plants are not stressed, following instructions on the label very carefully, keeping accurate records, and optimising growing conditions to reduce stresses.


Links and Resources

DAFWA - Diagnosing group herbicide damage

Introduction, herbicides, what to look for in paddock and plant, what else it could be, where did it come from, and monitoring. Page last updated 2014.