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Resistance of Cotton Cultivars to Verticillium Wilt and Its Relationship to Yield¹

Twenty-eight to 35 upland cotton cultivars (Gossypium hirsutum L.) representing a wide range of resistance to the fungus Verticillium albo-atrum (microsclerotial form) were grown in six tests spanning a 3-year period on moderately to severely infested fields. Various assessments of foliar or vascular damage to each of the cottons were made during the course of the season.

Ratings based on visual estimates of foliar damage made in either August or September were most closely related to yield performance, accounting for 35 to 65% of the yield variation among the cottons in five of the six tests. Percentages of plants showing early season foliar symptoms were less well correlated with yield, while postharvest vascular ratings showed virtually no yield correlation.

Key Words: Gossypium hirsutum L. • Verticillium albo-atrum • Disease ratings • Genetic tolerance • Physiological tolerance

² Specialist in Agronomy, University of California, Davis. Address: USDA Cotton Research Station, Shafter, CA 93263.

Received for publication April 8, 1974.