Picloram

Chemical class Pyrimidine herbicide
Chemical Structure Chemical structure of Picloram
CAS Number 1918-02-1
Mode of action I – Disruptors of plant cell growth (Synthetic Auxins)
Target pests Wide range of annual and perennial broadleaf weeds, noxious woody and herbaceous weeds
Hosts Winter cereal and linseed crops
Formulations Granular, emulsifiable concentrate, soluble concentrate, non-aqueous concentrate, liquid concentrate, suspension concentrate, aqueous concentrate, water soluble gels and oral bolus (chewable)
Home garden use No
No of Australian Approvals and Registrations 8 active constituents, 87 products
Poison schedule Appendix B, Part 3 (unscheduled chemical). Note: All the products are co-formulated and Schedules 5 and 6
Australian Health-based guidance values

ADI: 0.07 mg/kg bw per day (1987)

No Australian ARfD established

Key issues

  • Mobile in the environment. This may pose a risk to non-target organisms from run-off.
  • Potential environmental exposure resulting from spray drift from aerial spraying
  • No dietary exposure concerns.

Stakeholder perspective

  • Highly important herbicide for cereals and linseed.
  • Useful on broadleaf weeds that are difficult to control
  • Alternatives are available for use in vegetable crops.

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