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Ministry of Agriculture, Food and Rural Affairs

Picloram

Trade Name: Tordon 101

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 the roots, stems and foliage.
  • Translocation can be up or down with accumulation is in young, rapidly growing meristematic tissue.

Persistence

  • Injury may be observed in fall cover crops
  • Deep ploughing will minimize any carryover effect

 

Picloram injury on tomatoClick to enlarge