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Ministry of Agriculture, Food and Rural Affairs


Trade Name: Lorox

Group 7

Site of Action: Inhibitors of photosynthesis at photosystem II, Site B
Blocks electron transport and the transfer of light energy.


  • Occur after the cotyledons and first true leaves emerge
  • Include yellowing of the leaf margins or tips and yellowing between the leaf veins in broadleaf plants
  • Injured leaf tissue eventually turns brown and dies
  • Damage is usually observed on older growth

Uptake and Translocation

  • xylem mobile
  • moves upwards only

Half-life in soil: 60 days

Linuron herbicide injury