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

Group C herbicide damage

Constraint - Group C herbicide damage

Symptoms

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

Damage

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

Management

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

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.