Diagnosing group F herbicide damage in cereals

Group F herbicides are registered for selective control of wild radish, wild mustard and wild turnip control in cereals, legume crops and legume pastures.

Blotches can vary from white / yellow to mauve / red
Blotches are confined to leaves that are sprayed
Severe symptoms include temporary leaf bleaching and stunted plants with shortened internodes
Red patches on water-stressed Matika oat plants
Chemical name Example trade name
Group F - Nicotinanalides
Diflufenican

Brodal®
 

Tigrex®

(with MCPA)
 

Jaguar®

(with bromoxynil)
Picolinofen

Paragon®
 

Sniper®

Symptoms appear within 3 to 4 days of application (2 days in sunny weather)

What to look for

    Paddock

  • Uniformly affected plants with pale blotches.

    Plant

  • White/yellow spots streaks or bands that may be accompanied by mauve (or red in some oat varieties) discolouration
  • Effects disappear as new growth develops
  • Exceptionally high rates can result in stunted plants with shortened internodes

What else could it be

Condition Similarities Differences
Diagnosing contact herbicide damage in cereals Pale blotches and streaks on sprayed leaves Contact herbicide damage affected areas die rather than fade

Where did it come from?

Wet conditions
Wet conditions
Frost
Frost
Temperature
Temperature
  • Stressed plants are more liable to develop symptoms. Cold wet conditions, frost, or high temperatures after spraying.

Management strategies

  • There are no treatment options, plants either die or completely recover. As a precaution, spray when the risk of drift is low or when environmental conditions are safe.

See also

Herbicides

Further information

HerbiGuide
GRDC Incrop-Herbicide-Use
APVMA registered products database

Topics

Page last updated: Wednesday, 4 February 2015 - 2:48pm