pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-1-1-4 Articles Effect of Culture Medium and Light on Sporulation of Two Peanut Leaf Spotting Fungi, Cercospora Arachidicola Hori and Cercosporidium Personatum (Beck & Curtis) Deighton1 Yousef A-M. Abdou and William Earl Cooper 2 Former graduate student, Department of Plant Pathology (presently with Department of Agricultural Botany, Cairo University, Giza, U.A.R.) and Professor (deceased) of Plant Pathology, North Carolina State University, Raleigh, N. C. 27607. (Manuscript prepared by W. C. Gregory from unpublished PhD Thesis of the senior author.)

1Paper number 4228 of the Journal series of the North Carolina State University Agricultural Experiment Station, Raleigh, N. C. 27607.

 3 1974 1 1974 1 1 11 14 American Peanut Research and Education Society 1974 American Peanut Research and Education Society Abstract

Cercospora arachidicola and Cercosporidium personatum sporulated abundantly on certain culture media, while on others they produced none to few conidia. On some media which failed to support sporulation, the addition of an aqueous extract of peanut leaves markedly increased sporulation.

Light was not required for sporulation by C. arachidicola but was essential for sporulation by C. personatum. No conidia were produced by C. personatum in suitable media in continuous darkness or orange light, while greatly reduced sporulation occurred in yellow, blue, green, or red light. The pathogenicity of C. personatum grown under various wavelengths of light was unaffected.