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Ministry of Agriculture, Food and Rural Affairs


Trade Names: Lontrel 360, Transline

Group 4

Site of Action: Synthetic auxins


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


  • Half life in field: less than 30 days
  • Residuals may injure certain crops (such as tomatoes and peppers) planted 1 year after application

Photographs courtesy of:

F.A Holm and Ken Sapsford at University of Saskatchewan - Department of Plant Sciences - Weeds Research - Herbicide Injury Symptoms:


Clopyralid injury on Brassica Clopyralid injury on Brassica Clopyralid injury on Brassica Clopyralid injury on strawberry Clopyralid injury on strawberry Clopyralid injury on alfalfa Clopyralid injury on canada thistle Clopyralid injury on chickpea Clopyralid injury on grape Clopyralid injury on cabbage Clopyralid injury on potato Click to enlarge.