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Stalk Rot of Corn Caused by Helminthosporium rostratum. T. A. Kucharek, Assistant Extension Plant Pathologist, Florida Cooperative Extension Service, University of Florida, Gainesville 32601; Phytopathology 63:1336-1338. Accepted for publication 10 April 1973. DOI: 10.1094/Phyto-63-1336.

Helminthosporium rostratum was frequently isolated from naturally infected, rotted corn stalks at several locations in Florida during the summer of 1971. Inoculations with two isolates on corn in the greenhouse and in the field resulted in rotted stalks. Culture reisolation from stalks inoculated in the greenhouse resulted in 100% recovery of H. rostratum; whereas, culture reisolation from stalks inoculated in the field resulted in low frequencies of H. rostratum recovered and high isolation frequencies of Fusarium sp. and Aspergillus niger. Margins of rotted tissue yielded fewer cultures of H. rostratum and Fusarium sp. than did the centers of rotted tissue.