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Published in Crop Sci 20:787-789 (1980)
© 1980 Crop Science Society of America
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Host-Pathogen Variability for Fusarium-Caused Root Rot in Red Clover1

G. A. Pederson, R. R. Hill, Jr. and K. T. Leath2

Progenies from diallel crosses in red clover (Trifolium pratense L. cv. Arlington) were evaluated for reaction to four isolates of Fusarium roseum (Lk.) emend Snyd. and Hans. General combining ability effects were significant for length of rotted root after inoculation with F. roseum. Genetic effects other than general combining ability were not significant. Root rot tended to be more severe in plants with large than in those with small root diameters. Estimate of the isolate by host-genotype interaction variances were not significant, but different ranking of the parental means with isolates was observed. The heritability estimate for root rot severity was low (0.075). Our results indicate that selection for root rot resistance should be done by evaluation of progenies in replicated designs in which two or more virulent isolates of F. roseum are used.

Key Words: Trifolium pratense L. • Fusarium roseum (Lk.) emend Snyd. and Hans. • Root disease • Diallel analysis

1 Joint contribution of The Pennsylvania State Univ. and the USDA, SEA, AR. Authorized for publication as Journal Series No. 5920 by the Pennsylvania Agric. Exp. Stn., Univ. Park, PA 16802. Contribution No. 8003 of the U.S. Regional Pasture Research Laboratory, USDA-SEA-AR, University Park, PA 16802.

2 Graduate research assistant, research agronomist, and research plant pathologist, respectively.

Received for publication May 5, 1980.




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