Group B herbicide damage

Constraint - Group B herbicide damage

Symptoms

• Symptoms often appear five to eight days after exposure 
• Emerging or young plants can be stunted with curled or spiky new leaves
• Pale to yellow red or purplish colouration of new leaves, that may show as interveinal chlorosis (loss of colouration), streaks, mottles or blotches
• Reduced growth of lateral roots and head damage may occur in severe cases 

Damage

• Tillering may be reduced, but plants generally recover
• Damaged plants are more susceptible to root disease, nematodes, and trace element deficiencies

Control

There is no treatment. Plants will either die or recover. Observe withholding periods and aim to minimise stress to plants.

Links and Resources

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

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