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Abstract
The growth of Sclerotium rolfsii and Whetzelinia sclerotiorum was reduced when 5 X 10(-4) to 2 X 10(-3) M 1-phenyl-2-thiourea (PTU) was incorporated into synthetic media and potato dextrose agar (PDA). Whetzelinia sclerotiorum produced heavy aerial mycelia and few, if any, sclerotia in synthetic glucose-nitrate liquid medium containing 10(-3) and 2 X 10(-3) M PTU. At the same PTU concentrations in PDA. W. sclerotiorum formed abnormal sclerotia covered with a yellowish green exudate. Sclerotium rolfsii produced unusual patterns of aerial mycelia and no sclerotia on media containing 2 X 10(-3) M PTU. With 5 X 10(-4) M PTU, S. rolfsii produced sclerotial initials and some of these developed into atypical clumps of sclerotia. A yellow pigment developed when S. rolfsii grew on media containing PTU.
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