Sporulation ofCercospora arachidicolaas a Criterion for Screening Peanut Genotypes for Leaf Spot Resistance

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Abstract
The sporulation of C. arachidicola on peanut is defined as the number of conidia produced per infected peanut leaflet after 96 h of incubation at 25 .+-. 1.degree. C under continuous light (800 lx) and 100% relative humidity. A detached-leaf culture technique was used to determine sporulation on leaflets of 9 peanut genotypes. Genotypes that did not differ in numbers of lesions per leaflet, and numbers of conidia/mm2 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 [plant introduction] 109839, ''Florunner'' and ''Tamnut 74''. No difference in percent defoliation was observed among genotypes.

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