VIEW ARTICLE

Resistance

Sporulation of Cercospora arachidicola as a Criterion for Screening Peanut Genotypes for Leaf Spot Resistance. S. M. Gobina, Graduate student, Department of Plant Pathology, and Agronomy Department, USDA, ARS, Oklahoma State University, Stillwater 74078; H. A. Melouk(2), and D. J. Banks(3). (2)(3)Research plant pathologist, and research geneticist, respectively, Department of Plant Pathology, and Agronomy Department, USDA, ARS, Oklahoma State University, Stillwater 74078. Phytopathology 73:556-558. Accepted for publication 3 November 1982. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1983. DOI: 10.1094/Phyto-73-556.

The sporulation of Cercospora arachidicola on peanut is defined as the number of conidia produced per infected peanut leaflet after 96 hr of incubation at 25 ± 1 C under continuous light (800 lux) and 100% relative humidity. A detached-leaf culture technique was used to determine sporulation on leaflets of nine peanut genotypes. Genotypes that did not differ in numbers of lesions per leaflet, and numbers of conidia per square millimeter of lesion were significantly (P = 0.05) different in number of conidia per leaflet. No conidia were recovered from some genotypes even after prolonged incubation of infected leaflets. There was a significant linear correlation between necrotic area and lesions per leaflet on Comet, PI 109839, Florunner, and Tamnut 74. No difference in percent defoliation was observed among genotypes.