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Selective Medium for Quantitative Determination of Microslcerotia of Cylindrocladium species in Soil. O. C. de Almeida, Former graduate student, Departamento de Biologia Vegetal, Universidade de Brasilia, Brasilia, DF, 70.910 Brazil; H. A. Bolkan, associate professor, Departamento de Biologia Vegetal, Universidade de Brasilia, Brasilia, DF, 70.910 Brazil. Phytopathology 72:300-301. Accepted for publication 9 June 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-300.

A new selective medium was developed for monitoring the population density of microsclerotia of Cylindrocladium species in naturally and artificially infested soils. Colonies of Cylindrocladium on the new medium were small and surrounded by a distinctive dark halo that made colony recognition easy. Interference from undesired fungi was minimal. The recovery efficiency of the new medium ranged from 68 to 81.7%, depending on the number of microsclerotia added to soil.