artist's airbrush at about 0.6 kg/cm 2 air Ricker, M. D., Beute, M. K., and Campbell, C. L. 1985. Components of resistance in peanut to pressure so that the leaves were wetted Cercospora arachidicola. Plant Disease 69:1059-1064. without droplet runoff. Seventeen peanut breeding lines and Twenty genotypes of peanut (Arachis hypogaea) were tested in the greenhouse and ranked in the commercial cultivars Florigiant, NC increasing order of resistance to early leaf spot (Cercospora arachidicola) for each of the following 2, and NC 5 were obtained from J. C. components of rate-reducing resistance: number of lesions per leaf, lesion diameter, latent period, Wynne, North Carolina State University. time until leaflet defoliation, and sporulation. With the exception of lesion diameter, differences These genotypes, representing a range of among genotypes were found for all components. Number of lesions was influenced greatly by resistance to early leaf spot, were chosen environment and therefore was an unreliable means to evaluate these genotypes in the greenhouse. after evaluation in small field plots at Ranking of genotypes for latent period was consistent with two methods of measuring latent North Carolina State University. Plants 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 f each genotype were grown either from until leaflet defoliation. Genotype NC 3033 showed the greatest overall resistance to early leaf spot. seed or from shoot cuttings taken from
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M. D. Ricker (1985) studied this question.