Abstract
Reactions to early leaf spot, caused by C. arachidicola [Mycosphaerella arachidis], were evaluated at Perkins, Okla. in 1981 on 151 groundnut entries representing genotypes of cultivated Arachis hypogaea, wild A. spp. and hybrids. Plants were grown in single-row, 3 m plots that were irrigated weekly (2.5-3 cm); leaf spot was evaluated 115-120 days after planting. A subjective scale index of 1-5 (low to high response) was used to describe each of the following criteria: amount of leaf necrosis; degree of sporulation of M. arachidis; leaf defoliation. A leaf spot reaction index (LSRI) for each entry was obtained as the product of the leaf necrosis and sporulation indices, where the lowest and highest values of the LSRI were 1 and 25, respectively. The Kruskal-Wallis one-way analysis of variance by ranks and multiple-comparison test were used to test the equality of the effects of genotypes on these criteria. The Spearman rank correlation for each pair of criteria was calculated for each genotype. Significant positive correlations between LSRI and defoliation and between amount of leaf necrosis and defoliation were obtained for all genotypes. Information obtained from this statistical analysis is useful for evaluating resistance of groundnut entries
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