Airplane applications, involving various prepns. of DDT used as both sprays and dusts, together with Ryonia, rotenone and benzene hexa-chloride used as dusts, were made in commercial fields in tests on the control of the 2d generation of the European corn borer, Pyrausta nubilalis, in canning sweet corn. Ryonia dust and DDT used as a dust or in oil soln. were found to be suitable for airplane application. The treatments resulted in increased yields, reduced labor requirements in the canning factory, and afforded label protection by reducing the hazard of borer contamination in the canned product. In no case were the treatment materials found to retard or stimulate plant growth. DDT was found to leave much higher residues when applied in oil soln. than when applied as a water emulsion or as a dust.