(2) During spraying

• Always monitor weather conditions and understand their effects. Do not spray if unsuitable, and stop if conditions change.

• Minimize spray release height.

• Select herbicide type to minimize potential drift. Always use least-volatile formulation available. If sensitive crops in area, use least damaging herbicides. If possible, add drift retardant.

• Keep a supply of various nozzle types.

• Spray early morning when wind is still calm.

• Have ultimate control of drift management.

There is a legal aspect of herbicide drift from the Agricultural Practices (Disputes) point of view, registration of chemicals and the Environmental Protection Act. In addition to crop yield loss legal suite, the Department of Environmental Protection can prosecute a person that "causes or allows to be caused pollution”. Herbicide drifts can be simply prevented or reduced, if properly handled. In all cases, one should avoid spraying during certain weather conditions such as midday turbulence, high temperature, high humidity and still conditions (high wind).

Documenting chemical drift (required information)

• Date of application and herbicide/tank-mix information.

• Herbicide name and rate.

• Wind direction, speed and temperature.

• Type of applicator, boom height, nozzle type, spray pressure, nozzle orientation and spray volume.

• If crop damage occurred, record crop and herbicide history of the damaged field, map of the area, yield loss estimates to predict the extent of damage and of course take a large number of high-quality photographs.


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