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Ministry of Agriculture, Food and Rural Affairs

paraquat

Trade Name: Gramoxone

Group 22

Site of Action: Photo system I - electron diverters

Symptoms
Following POST emergent application:

  • 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

Persistence

  • Highly persistent but residues are tightly adsorbed and unavailable in the soil
  • Essentially no residual activity in soil
  • Half-life in field: 1000 days
Paraquat injury on pepper
Click to enlarge.