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Estimating Fusarium Wilt Reactions of Cotton Genotypes¹

Fusarium ilt reaction of certain cultivars of cotton (Gossypium hirsutum L.) were estimated for years in which they were not actually tested. Actual and estimated or predicted values weret hen compareads were methodosf prediction. Estimatedv alues of the percentage of wilting due to Fusarium oxysporum Schlect. f. vasinfectum (Atk.) Snyd. & Hans. or a given cultivar cotton, calculated as ratios of the susceptible check ‘Rowden,’ were not greatly different from observed wilting percentages. When Rowden was used as the predictive base, only four of 48 values calculated using the ratio method of estimating means fell outside of the 95% confidence limits of estimates made using the least squares regression technique. When the resistant check, ‘Auburn 56,’ was used as the predictive base, 29 of 48 means were outside the 95% confidence limits. However since Rowden was planted much more frequently in all tests, wilting for the cultivar was based on a much larger number of plants grown over the widest range of environments. Reliable estimates of wilting percentages for cotton cultivars not actually grown a given year can then be made using simple ratios based on Rowden.

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

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

Received for publication April 16, 1976.