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


Group C herbicide damage

Constraint - Group C herbicide damage


  • Plants emerge normally, but then become pale/scorched

  • Necrosis on leaf progresses from the edges to the veins, and older leaves begin to die

  • Direct spray damage is uniformly distributed but varies with spray coverage 


  • Residue affected plants will be worse on soils that are wetter, sandier, lower in organic matter or more alkaline

  • Triazine tolerant canola is tolerant, bit other varieities are susceptible

  • Yield penalty can occur, depending on exposure


There is no treatment. Management options include spraying when the risk of drift is low, following instructions on the label very carefully, keeping accurate records, and optimising growing conditions to reduce stresses.



Links and Resources

PDF BCG - Group C carry over

4 page PDF. Summary of trial, why it was conducted, how it was conducted, results, group B herbicides, group C herbicides, and commercial practice.

File size: 66kb
DAFWA - Diagnosing group C herbicide damage

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

File size: 66kb