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Ministry of Agriculture, Food and Rural Affairs

Clopyralid

Trade Names: Lontrel 360, Transline

Group 4

Site of Action: Synthetic auxins

Symptoms

At first symptoms include:
  • Bending, twisting, swelling and elongation of stems
  • Leaf cupping and curling
Followed by:
  • Chlorosis at the growing points
  • Growth inhibition
  • Wilting
  • Necrosis, and death of susceptible plants within 3- 5 weeks
  • Low concentration may cause young leaves to look puckered

Uptake and Translocation

  • Rapidly absorbed by foliage
  • Translocated readily throughout the plant via both xylem and phloem systems
  • Clopyralid is distributed throughout the plant to the meristem

Persistence

  • Half life in field: less than 30 days
  • Residuals may injure certain crops (such as tomatoes and peppers) planted 1 year after application
Clopyralid injury on Brassica Clopyralid injury on Brassica Clopyralid injury on BrassicaClopyralid injury on cabbage
Click to enlarge.