Fenbutatin oxide

Chemical class Organotin miticide
Chemical Structure Chemical structure of Fenbutatin Oxide
CAS Number 13356-08-6
Mode of action 12B – Inhibitors of mitochondrial ATP synthase
Target pests Mites
Hosts Pome and stone fruit, avocados, bananas, citrus, strawberries, hops and ornamentals
Formulations Suspension concentrate (flowable concentrate)
Home garden use No
No of Australian Approvals and Registrations 5 active constituents, 3 products
Poison schedule Schedule 6
Australian Health-based guidance values

ADI: 0.01 mg/kg bw per day (1987)

No Australian ARfD established

Key issues

  • Very toxic by inhalation. As it is applied with air blast equipment (to penetrate canopy), it may present inhalation risks to workers; the current risk mitigation measures may not be adequate. Further, there are no REI on the labels. Additional PPE and label instructions may be needed to address worker safety issues.
  • The EU assessment found high persistence in environment and high aquatic toxicity.
  • Higher spray drift risk from air blast application.
  • Current dietary exposure estimates are close the ADI indicating very little scope to include additional commodities in future MRL requests.

Stakeholder perspective

  • Considered highly important for pest management in citrus, papaya and other horticulture crops.

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