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A Selective Toxin Produced by Phyllosticta maydis. O. C. Yoder, Assistant Professor, Department of Plant Pathology, Cornell University, Ithaca, N.Y. 14850; Phytopathology 63:1361-1366. Accepted for publication 23 April 1973. DOI: 10.1094/Phyto-63-1361.

Culture filtrates from isolates of Phyllosticta maydis pathogenic to corn, inhibited root growth and shoot development of P. maydis-susceptible corn more than that of P. maydis-resistant corn. Culture filtrate from nonpathogenic P. zeae did not selectively inhibit growth of P. maydis-susceptible corn. Both P. maydis and P. maydis culture filtrate appear to be selective for corn with Texas male sterile cytoplasm.

Additional keywords: host-specific toxin, yellow leaf blight of corn.