The widespread use of airplanes for the dusting of cotton for boll weevil control constitutes the most striking advance step in weevil control work for 1925. Experimental work in this field has been conducted through cooperation between the Army Air Service and the Delta Laboratory at Tallulah, Louisiana under the direction of Mr. B. R. Coad since 1922. A regularly organized commercial airplane dusting service was first available for the season of 1925. An airplane especially constructed for dusting work carries 500 pounds of calcium arsenate at a load. The plane is flown back and forth across the cotton fields at a height of from 10 to 25 feet and so that the dust cloud will cover a strip of cotton from 200 to 250 feet wide. These planes travel at a speed of 100 miles per hour, dusting an acre of cotton in less than two seconds. One plane can protect 5,000 acres of cotton through the season. Such service is available to cooperating groups of planters situated in territory favorable for airplane work and within a radius of from 10 to 15 miles usually from a central landing field, at a cost practically the same as for doing their own work. This puts boll weevil control work into professional hands and relieves planters and plantation labor from disagreeable night work. Airplanes are able to dust in daylight in spite of light breezes and can give very prompt protection after heavy rains and to the rankest growth of cotton. In practical use they have proven to be very satisfactory in controlling the boll weevil on cotton and have been used successfully also for treatment for peach orchards for the control of plum curculio and brown rot.