Diagnosing group F herbicide damage in narrow-leafed lupins

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

Bright white or yellow chlorosis on young leaves or parts of leaves that slowly  fades
Young growth is affected
Nicotinanalides
Chemical name Example trade name

Diflufenican

Brodal®

Picolinofen

Tigrex® (with MCPA)

 

Jaguar® (with bromoxynil)

 

Paragon® Sniper ®

 

What to look for

    Paddock

  • Direct spray damage is uniformly distributed but varies with spray coverage on overlaps or boom turns.

    Plant

  • Bright white or yellow bleaching of young leaves or parts of leaves that slowly fades.
  • Plants generally recover.
  • Stressed plants are more liable to develop symptoms. Causes include cold, wet conditions, or frost or high temperatures after spraying.

What else could it be

Condition Similarities Differences
Diagnosing contact herbicide damage in narrow-leafed lupins Pale leaf lesion on sprayed leaves These rapidly become necrotic and the plant may die.

Where does it occur?

  • These herbicides are more active in moist soil.
  • Situations where the herbicide is close to seed. This includes shallow sowing or heavy rain washing herbicide into furrows in ridged seedbeds.
  • Topsoils with low adsorption capacity such as sands with low organic matter.

Management strategies

  • No treatment - plants can grow out of it

How can it be monitored?

  • It is important to observe withholding periods for these herbicides to avoid damage to following crops.
  • Take care when spraying not to spray non-tolerant varieties

Where to go for expert help

Page last updated: Thursday, 5 February 2015 - 3:05pm