Table 2 Summary of current surveillance and response procedures in New Zealand, Australia and California for B. tryoni and B. dorsalis

Surveillance Trapping to Maintain PFA

For B. tryoni, a 400 m trapping grid which equates to a density of 6.5 traps per km² or 0.065 traps per hectare

For B. dorsalis, a 1200 m trapping grid which equates to a density of 0.72 traps per km² or 0.0072 traps per hectare

For urban areas, a 400 m trapping grid which equates to a density of 6.5 traps per km² or 0.065 traps per hectare

For production areas, a 1000 m trapping grid which equates to a density of 1.04 traps per km² or 0.0104 traps per hectare

For urban areas, a 1000 m trapping grid which equates to a density of 1.04 traps per km² or 0.0104 traps per hectare

For production areas, a 2000 m trapping grid which equates to a density of 0.26 traps per km² or 0.0026 traps per hectare

Response Triggers

Detection of any juvenile life stage or gravid female fly for eradication

OR

Detection of 1 adult male fly for delimitation

OR

Detection of 2 or more* adult male flies for eradication

* depends on the circumstance of the finds

Detection of any juvenile life stage or gravid female fly for eradication

OR

Detection of 2 to 4 adult male flies within 14 days and 1 km for delimitation

OR

Detection of 5 or more adult male flies in 14 days within 1 km for eradication

Detection of any juvenile life stage or gravid female fly for eradication

OR

Detection of 2 adult (non-gravid) flies within 28 days and 4.8 km for delimitation

OR

Detection of 6 (urban) or 8 (commercial) adult (non-gravid) flies within 28 days and 4.8 km for eradication

Size of Export Restriction Zone

Depends on the circumstance of the eradication and largely dictated by trading partners

15 km radius

8.2 km radius

Surveillance Trapping to Reinstate the PFA

For B. tryoni, a trapping density of 0.283 traps per hectare

For B. dorsalis, a trapping density of 0.142 traps per hectare

For urban and production areas, a trapping density of 6.5 traps per km² or 0.065 traps per hectare

For urban areas, a trapping density of 0.029 traps per hectare

For commercial production areas, a trapping density of 0.022 traps per hectare

Pest Free Area Reinstatement (after last fly detection)

Depends on the circumstance of the eradication and largely dictated by trading partners

Zero detections within one B. tryoni generation (egg to egg) and 28 days, or 12 weeks (whatever is the longer). No minimum trapping density is specified

Zero detections within three B. dorsalis generations (egg to egg)

No minimum trapping density is specified