Technical DDT at the rate of 4.5 to 12 pounds an acre—depending upon the method and number of applications—is applied to most of California's commercial sweet corn acreage to control the corn earworm.

The above progress report is based on Research Project No. 1275-F.

Determinations of DDT residue on corn were made at Riverside by L. D. Anderson, Entomologist, and F. A. Gunther, Associate Insect Toxicologist, University of California.

The investigations with DDT on alfalfa hay were conducted by Ray F. Smith, Associate Professor of Entomology, and W. M. Hoskins, Professor of Entomology, University of California, Berkeley; and O. H. Fullmer, formerly Research Assistant, University of California, Berkeley.

The studies with pea vine silage were made by H. F. Wilson, Professor of Economic Entomology; N. N. Allen, Professor of Dairy Husbandry; G. Bohstedt, Professor of Animal Husbandry; J. Betheil, Graduate Assistant in Biochemistry; and H. A. Lardy, Assistant Professor in Bacteriology, University of Wisconsin.