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Assessment of resistance to leaf spot diseases among alfalfa cultivars in north carolina usa fields



Assessment of resistance to leaf spot diseases among alfalfa cultivars in north carolina usa fields



Phytopathology 77(6): 964-968



Experimental plots were sampled destructively and leaves on individual stems were evaluated visually for leaf spot [Cercospora medicaginis, Leptosphaerulina brioslana, Stemphylium botryosum] severity to assess differences in disease level among 16 alfalfa cultivars. Samples were collected from sites in Rowan and Washington counties during 1983 and in Rowan, Sampson, Wake, and Washington counties during 1984. Disease severity was estimated for each leaf on a stem. Total length, length of defoliation up the stem, number of intact and defoliated nodes, and number of abscised main stem leaves were measured for each stem. Significant differences were detected among cultivars in disease severity, maximum disease on a stem, and percentage of nodes with abscised main stem leaves. A cultivar by location interaction was not detected. Florida 77 appeared to be more susceptible than most other cultivars, whereas Raidor had a higher level of resistance to leaf spot diseases than other cultivars. Stability analysis indicated that Raidor has the most stable disease resistance. High correlations (r .gtoreq. 0.70) were detected among several of the variables measured. Cluster analysis was used to group cultivars on the basis of disease severity and percentage of defoliated nodes.

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Accession: 004787998

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