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Ministry of Agriculture, Food and Rural Affairs


Trade Names: Checkmate, MCPA Ester, MCPA-Sodium Salt, MCPA Amine

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

  • Absorbed through leaves or roots
  • Translocates to, and accumulates at, growing points of roots and shoots


  • Some soil residues can be detected for up to 1 month under moist conditions and 2 months under drier conditions

Photographs courtesy of:

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


MCPA injury on flaxMCPA injury on wild mustardClick to enlarge