PT-3 aircraft dusts sulfur on a vineyard to control pests in Fresno, California.

US Army Air Corps PT-3 aircraft being used to control pest in Fresno, California. Two consolidated PT-3 aircraft on a field as a man in the foreground speaks about the usage of PT-3 aircraft equipped with dust mechanism to dust sulfur on crops to control pest. He explains how crop dusting works. Men load sulfur in the aircraft. PT-3 aircraft dusts sulfur on a vineyard as it emits a smoky trail.