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In Vitro Antagonism of Trichoderma species Against Six Fungal Plant Pathogens. D. K. Bell, Associate professor of Plant Pathology, University of Georgia, USDA, ARS, University of Georgia Coastal Plain Experiment Station, Tifton 31793; H. D. Wells(2), and C. R. Markham(3). (2)(3)Research plant pathologist and biological technician, respectively, USDA, ARS, University of Georgia Coastal Plain Experiment Station, Tifton 31793. Phytopathology 72:379-382. Accepted for publication 19 August 1980. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982. DOI: 10.1094/Phyto-72-379.

Antagonistic activities of 77 isolates of Trichoderma, primarily T. harzianum, against representative isolates of Sclerotium rolfsii, Ceratobasidium cornigerum, Phytophthora parasitica f. nicotianae, Pythium aphanidermatum, P. myriotylum, and anastomosis groups 1, 2, 3, and 4 of Rhizoctonia solani were compared in vitro on 20% V-8 juice agar. Each pathogen isolate was antagonized by one or more isolates of Trichoderma. However, the greatest difference was in Trichoderma pathogen isolate interaction, indicating that a single isolate of Trichoderma can be highly effective against an isolate of a pathogen species, but may have only minimal effects on other isolates of the same species. This was especially evident in interactions with R. solani.

Additional keywords: biological disease control, soilborne disease.