A Restricted Product, a Neighbour, and a Drift Complaint
You are a licensed applicator treating a 2 ha field of soybeans with a herbicide on a warm, breezy afternoon. Wind is from the southwest at about 14 km/h with gusts to 22 km/h. A neighbour's vegetable garden and a row of young shade trees lie 40 m to the northeast. The product label lists a 30 m buffer zone downwind for sensitive crops, prohibits application when wind exceeds 15 km/h, and requires a 12-hour re-entry interval. The product is a provincial Class 2 pesticide requiring additional certification, which you hold. You finish at 4:30 p.m. At 6 p.m. the neighbour calls complaining that garden leaves are curled and discoloured.
1. Evaluate whether the application complied with the label and provincial requirements, identifying each potential violation.
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Several potential violations emerge:
- Wind speed: gusts to 22 km/h exceed the label's 15 km/h limit. Even if the average was 14 km/h, gusts above the limit mean application should have stopped or been postponed.
- Buffer zone: the label requires a 30 m downwind buffer for sensitive crops. The garden is 40 m away, which meets the distance only if wind direction and the buffer are measured correctly - but with gusts and drift-prone conditions, the effective risk may exceed the buffer's protection. The applicator must confirm the downwind sensitive area and buffer before spraying.
- Certification: you hold the Class 2 certification, so that requirement is met, but the licence and product classification should be documented.
- Re-entry interval: the 12-hour REI applies to the treated field; ensure workers and the neighbour are informed and signage posted if required.
- Notification: provincial rules may require advance notice to neighbours for certain products; confirm whether notice was given.
The strongest violations are the wind gust exceedance and possibly inadequate buffer management. The complaint must be taken seriously and documented.
2. What immediate and follow-up steps should you take after the complaint, including investigation, communication, and record-keeping?
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Immediate and follow-up steps:
- Stop and secure. Do not make further applications in the area until the situation is assessed.
- Document conditions. Record wind speed and direction at the time of application, temperature, time started and finished, product, rate, nozzle type, pressure, boom height, and buffer distance. Note the discrepancy between average wind and gusts.
- Inspect the damage. Visit the garden with the neighbour, photograph symptoms, note the pattern (downwind edge, tree height), and compare with the label's sensitive-crop list. Herbicide symptom patterns can help confirm drift versus disease or other causes.
- Communicate honestly. Acknowledge the complaint, explain what you are investigating, and avoid admitting or denying liability prematurely. Provide re-entry and safety information.
- Notify as required. Report to the provincial regulator if the label or regulations require it, and cooperate with any investigation.
- Review and correct. Reassess drift management: lower boom, larger droplets, lower pressure, drift-reducing nozzles, spray only within wind limits, increase buffer, and consider spraying when neighbours are less exposed.
- Keep records. Retain application records, weather data, jar tests, calibration, and correspondence as required by regulation.