Chlorothalonil

Chemical class Chloronitrile fungicide
Chemical Structure Chemical structure of Chlorothalonil
CAS Number 1897-45-6
Mode of action M5 – Multi-site activity
Target pests Variety of fungal diseases on crops, ornamentals and timber
Hosts A variety of fruit and vegetable crops, turf, ornamentals, freshly-sawn Pinus spp. timber and in various tree and vine crops
Formulations Aqueous concentrates, liquid, suspension concentrate (flowable concentrate), water dispersible granules, emulsifiable concentrate, suspoemulsion and soluble powder
Home garden use No
No of Australian Approvals and Registrations 14 active constituents, 63 products
Poison schedule

Schedule 6

Chlorothalonil except in water-based paint containing 0.5 per cent or less of chlorothalonil
Australian Health-based guidance values

ADI: 0.01 mg/kg bw per day (1991)

No Australian ARfD established

Key issues

  • No Australian ARfD has been established.  Potential dietary exposure concerns arise when considered against JMPR or EU ARfDs
  • Chronic dietary exposure is close to 90% of the ADI
  • Label changes may be necessary to address worker safety issues
  • A breakdown product is environmentally more toxic than the parent and is more environmentally persistent
  • Due to a change of classification of the mode of action a proportion of product labels contain the incorrect mode of action

Stakeholder perspective

  • Chlorothalonil is considered of high or critical importance for pest management in a number of crops
  • Also important to the turf industry; no sign of resistance has emerged
  • Used by the Department of Agriculture and Water Resources during pest management activities and at pre-entry quarantine sites

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