Disease severity of Verticillium wilt was only slightly reduced by the nonfungitoxic compounds—but yield increased between 10 and 29 percent.

Funds for this research, provided by the USDA, made available through Cotton Incorporated, Raleigh, North Carolina, grants-in-aid by California Planting Cotton Seed Distributors, Bakersfield, California, Mobay Chemical Corporation, Division of Baychem, Kansas City, Missouri, American Cyanamid Co., Princeton, New Jersey, and BASF Wyandotte Corp., Parsippany, New Jersey, are gratefully acknowledged. We wish to thank Dr. H.B. Cooper and Associates, Agricultural Research Service, USDA, Cotton Research Station, Shafter, California, for valuable assistance in the field research.