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Sunflower Yellows, a New Disease Caused by Phialophora sp.. J. A. Hoes, Plant Pathologist, Canada Department of Agriculture, Research Station, Morden, Manitoba ROG 1J0; Phytopathology 62:1088-1092. Accepted for publication 24 March 1972. DOI: 10.1094/Phyto-62-1088.

Yellows, a new systemic disease of sunflower, Helianthus annuus, was found in Manitoba, Canada, in 1968. Yellows is caused by Phialophora sp. Chlorosis and necrosis of the leaves, dwarfing, and sterility are the main symptoms. The pathogen was isolated from all parts of the plant except florets and seed.