crop dusting 
noun [mass noun]
The spraying of powdered insecticide or fertilizer on crops, especially from the air.According to Time magazine, this was all in response to the FBI finding instructional material on crop dusting in the apartment of one of the attackers....
- The profession of crop dusting often requires a pilot to be fairly mobile and migrate to where the work is.
- ‘In crop dusting, the farmers would buy and supply the actual chemicals,’ he says.
Derivatives
crop duster
- A crop duster sweeps low over a field, aiding farmers in a battle against late season insects.
- All the crop duster does is act as an applicator of the chemicals.
- By the time he was 18, in 1973, he was working as a crop duster.