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Effect of Verticillium Wilt on Cotton Yield, Fiber Properties, and Seed Quality¹

Three varieties of upland cotton (Gossypium hirsutum L.) that differed in susceptibility to Verticillium alboatrum (microsclerotial form) were planted on three dates at 10-day intervals. They were inoculated with V. albontrum by stem puncture in July, August, and September. Most of the damage to fiber properties and seed germination resulted from the August inoculation when bolls were in early stages of maturation. Most of the seed weight loss occurred following the September inoculation. No reduction in yield, fiber properties, or seed weight and only occasional loss of germination occurred following the July inoculation.

Poor quality seed from infected plants resulted in poor stands. The amount of damage correlated with known varietal susceptibility. This method of inoculation permitted detailed assessment of resistance to V. albo-atrum under field conditions.

Key Words: Verticillium albo-atrum, • Gossypium hirsutum L.

² Plant Pathologist, Research Associate, Department of Plant Pathology and Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture and Professor, Department of Agronomy. Current address of senior author: Department of Plant Pathology, North Dakota State University, Fargo 58102.

Received for publication April 15, 1970.