Components of Resistance in Peanut toCercospora arachidicola

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Abstract
Twenty genotypes of peanut (Arachis hypogaea) were tested in the greenhouse and ranked in increasing order of resistance of early leaf spot (Cercospora arachidicola) for each of the following components of rate-reducing resistance: number of lesions per leaf, lesion diameter, latent period, time until leaflet defoliation, and sporrulation. With the exeception of lesion diameter, differences among genotypes were found for all components. Number of lesions was influenced greatly by environment and therefore was an unreliable means to evaluate these genotypes in the greenhouse. Ranking of genotypes for latent period was consistent with two methods of measuring latent period: time until at least two lesions sporulated and time until 50% of the lesions sporulated. Genotypes with longer latent periods and fewer sporulating lesions generally had a longer period until leaflet defoliation. Genotype NC 3033 showed the greatest overall resistance to early leaf spot.