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Disease Note.

Occurrence and Pathogenicity of Fusarium proliferatum on Corn in Minnesota. Thor Kommedahl, Department of Plant Pathology, University of Minnesota, St. Paul 55108. K. K. Sabet, P. M. Burnes, and C. E. Windels. Department of Plant Pathology, University of Minnesota, St. Paul 55108. Plant Dis. 71:281. Accepted for publication 9 December 1986. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0281B.

Fusarium proliferatum (Matsushima) Nirenberg, recently separated from F. moniliforme Sheldon (I) and of unknown pathogenicity, was isolated from 5% of 1,000 mature cornstalks in northwest Minnesota in 1985 (2) and made up 3% of 2,800 Fusarium colonies from roots of mature corn (Zea mays L.) in Waseca (southern Minnesota) in 1986. Among 28 isolates of F. proliferatum grown on toothpicks used to inoculate corn at St. Paul (10 plants per isolate) in 1986, the average infection rating on a scale of 1-4 was 2.8, compared with 3.5 for five isolates of F. graminearum Schwabe. F. proliferatum in a cornmeal:sand medium mixed with autoclaved soil and planted to corn in the greenhouse (24 C) resulted in rotted kernels at 50% inoculum (v/v) and in seedlings (four-leaf stage) that were one-third as tall as controls and less developed, discolored roots at 10% inoculum (v/v).

References: (I) W. Gerlach and H. Nirenberg. Mitt. Biol. Bundesanst. Land. Forstwirtsch. Berlin-Dahlem 209: I, 1982. (2) C. E. Windeis et al. Phytopathology 76: 1061, 1986.