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Correlation of Fusarium Wilt of Cotton in the Field and Greenhouse¹

Cultivar expression of cotton (Gossypium hirsutum L.) to Fusarium oxysporum Schlecht f. vasinfectum (Atk.) Snyd. & Hans, was studied under field conditions where nematodes were present and under greenhouse conditions where only the wilt fungus was artificially introduced into the plant.

In greenhouse studies, seedlings were artificially inoculated with either mixtures or individual wilt isolates in the absence of nematodes. When a highly-virulent isolate of fusarium was used for greenhouse inoculations, results were highly correlated with those obtained under field conditions where nematodes and wilt were both present. Isolates of fusarium obtained from resistant or susceptible varieties were not always of high or low virulence, respectively. Therefore inoculum of known high virulence must be used in greenhouse tests for symptom expression to be correlated with that obtained under field conditions.

Key Words: Gossypium hirsutum L. • Fusarium oxysporum f. vasinfectum • Nematodes

² Research pathologist, ARS, USDA, Auburn, AL 36830.

Received for publication August 8, 1974.