Skip to content.

Some features of this website require Javascript to be enabled for best usibility. Please enable Javascript to run.

Ministry of Agriculture, Food and Rural Affairs


Trade Name: Gramoxone

Group 22

Site of Action: Photo system I - electron diverters


  • Within a few hours, in full sunlight, the plant wilts and dries out
  • In 1- 3 days complete foliar necrosis occurs
  • Injury from drift can occur and presents itself as spots of dead leaf tissue wherever there is contact by spray droplets

Uptake and Translocation

  • Absorbed by foliage and green bark
  • Little or no translocation


  • Highly persistent but residues are tightly adsorbed and unavailable in the soil
  • Essentially no residual activity in soil
  • Half-life in field: 1000 days


  • Initially yellow spots turning tan to bronze spots where spray contacts tissue
  • Most severe on leaves near the ground

Often Confused With
Black rot:  dark pycnidia in lesions

Scouting Notes
Look for yellowed and dying weeds under the vines.

Management Notes

  • Avoid contact with fruits, new shoots or foliage. 
  • Do not spray under windy conditions. 
  • Use a shielded sprayer.
  • Use low pressures that produce large droplet sizes to avoid drift.
  • Grow tubes provide excellent protection of newly planted vines from herbicides.

Gramoxone damage Gramoxone damage Gramoxone damage Gramoxone damage Gramoxone damage Gramoxone damage Gramoxone damage Gramoxone damageClick to enlarge.