First "Crop Dusting". August 3, 1921.

On this day in 1921, crop dusting, spraying pesticides by air, was performed for the first time in an experiment involving the U.S. Army and the U.S. Department of Agriculture.

First crop dusting being conducted.

The first flight featured Army Air Corps pilot John A. Macready and aircraft engineer Etienne Dormoy who performed the test with a Curtiss JN4 over a field outside of Troy, Ohio.  Lead arsenate was sprayed to attack caterpillars.

Dormay left, Macready right.

Macready would complete an Army career prior to World War Two, leaving the service in 1926, but was recalled to serve in the Second World War.  He retired from the Army Air Force in 1948.  He was a legendary pilot at the time and had many firsts while in the service, including being the first Air Corps pilot to parachute from a stricken aircraft at night.