Effect of Chaetomium cupreum on Seed Germination and Antagonism to Other Seedborne Fungi of Soybean. C. C. Yeh, Graduate Research Assistant, Department of Plant Pathology, University of Illinois, Urbana 61801. J. B. Sinclair, Professor, Department of Plant Pathology, University of Illinois, Urbana 61801. Plant Dis. 64:468-470. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-468.

Chaetomium cupreum was isolated from three soybean seed lots of two cultivars grown at three locations in Illinois in 1979. This is the first report of C. cupreum in soybean seeds. In dual cultures, zones of inhibition developed between C. cupreum and Fusarium sp., Macrophomina phaseolina, Phomopsis sp., and Rhizoctonia solani. The growth of Cercospora kikuchii, Colletotrichum dematium var. truncata, Fusarium sp., M. phaseolina, Phomopsis sp., and R. solani but not of Cercospora sojina or Gliocladium roseum was inhibited on water agar mixed with the culture filtrate of C. cupreum and autoclaved. Ethyl ether soluble fractions of the culture filtrate of C. cupreum inhibited the growth of all fungi mentioned and of Alternaria sp. and delayed germination of soybean seeds. The fraction had absorption maxima at 230, 250, 280, 290, and 505 nm in water.