Almond hull rot, caused by two genera of fungi, can result in severe dieback on vigorous, productive trees. Research is under way to find effective measures for controlling the disease.

This study is supported by the Almond Control Board. The authors thank Dale Morrison, Director—Special Projects, Almond Control Board, and members of the research advisory committee for their suggestions and cooperation, and growers Otis Freeman and Bill Boos, Fresno County, and Fred Nottelmann, Butte County, who provided their orchards for the 1975 studies.