Analysis and Comparison of Fusiform Rust Disease Progress Curves for Five Slash Pine Familes

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Abstract
Disease progress curves were employed to quantify genetic variation in fusiform rust (caused by Cronartium fusiforme) resistance among 5 half-sib slash pine [Pinus elliottii var. elliottii] families planted at 2 locations [Mississippi and Louisiana, USA]. A growth analysis procedure was adopted whereby disease progress curves for each family were smoothed by fitting polynomials in time to cumulative percent infection. Then the coefficients for each polynomial fit were subjected to univariate and multivariate analyses of variance. Family effects were strong and statistically significant; location and location .times. family effects were identifiable but not statistically significant. Three distinct categories of disease progress curves were found: resistant, intermediate and susceptible. Methods are advanced to quantify and evaluate the importance of factors that affect disease progress in fusiform rust and other plant diseases.

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