Abstract
Phytotoxic substances were isolated from culture filtrates of Exserohilum turcicum grown in Fries' medium, or from susceptible corn plants infected with the fungus. The substances significantly inhibited chlorophyll biosynthesis in corn seedlings susceptible to E. turcicum but not in those resistant to the fungus. The phytotoxic substances were extracted from culture filtrates of eight different isolates of E. turcicum. A positive correlation was found between lesion size of isolates and phytotoxic activity(.)
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