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Ministry of Agriculture, Food and Rural Affairs


Trade Name: Telar, Truvist

Group 2

Site of Action: Inhibitors of acetolactate synthase (ALS) and also called acetohydroxyacid synthase (AHAS)


  • Following POST emergent application:
  • Within an hour the inhibition of ALS enzyme leads to a rapid cessation of cell division and plant growth
  • Within 1- 2 weeks symptoms become visible
  • Meristematic regions are the first to experience chlorosis and necrosis followed by general foliar chlorosis and necrosis
  • The most recently emerged leaf at time of application will show a characteristic Group 2 “flash” (a chlorotic band running perpendicular across the middle of the leaf)

Uptake and Translocation

  • Thoroughly systemic after absorption of either foliage or roots.
  • Foliar absorption is rapid.


  • Half-life is 4–6 weeks under growing season conditions.
  • Degradation is faster with higher soil temperatures and/or lower soil pH.

Chlorsulfuron injury on grape Chlorsulfuron injury on cherry

Click to enlarge.