Chemical class Triazole herbicide
Chemical Structure Chemical structure of Amitrole
CAS Number 61-82-5
Mode of action Q – Bleachers: Inhibitors of carotenoid biosynthesis unknown target
Target pests Range of weeds including grasses, broadleaved weeds, nut grasses, blackberries and cumbungi
Hosts Orchards, vineyards, irrigation ditches and drains, forestry plantations, roadsides, industrial settings, agricultural land
Formulations Aqueous concentrates, liquid, suspension concentrate (flowable concentrate), wetable powder, soluble concentrate and emulsifiable concentrate
Home garden use Yes
No of Australian Approvals and Registrations 3 active constituents, 21 products
Poison schedule Schedule 5. Note: Some products are co-formulated and Schedule 7.
Australian Health-based guidance values

ADI: 0.0003 mg/kg bw per day (1984)

No Australian ARfD established

Key issues

  • Current PPE may not be adequate.
  • Risks from bystander exposure.

Stakeholder perspective

  • Amitrole is one of the few chemicals available for controlling volunteer canola and cotton.
  • It is important for resistance management in cotton. Key chemical for control of fleabane.
  • Important in apple and pear production for resistance management and preserve other chemicals.
  • It is used to in faba bean and mung bean production; however, not a key chemical because several alternatives are available.

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