Abstract
Fusarium culmorum, Cochliobolus sativus, Curvularia ramosa, Gaeumannomyces graminis var. tritici and Phialophora graminicola were tested for their ability to produce colonies on unsterilized filter paper. Colonies of the first three species sporulated well on the paper moistened with a mineral salts solution but in no species did colonies exceed a mean diameter of 17 mm. The chief determinant of colony size seemed to be inoculum potential of the PD inocula which was determined by the nutrition of the fungus. In all species except P. graminicola , inoculum potential of the inocula declined significantly with age of mycelium. A correlation was found between linear growth rate on PD agar, taken as a parameter of general metabolic rate, and percentage reduction in diameter of colonies on filter paper, due to ageing of the mycelium. Linear growth rate has been used as the denominator of the cellulolysis adequacy index and the implications of these findings for saprophytic survival on cellulosic substrates have been discussed.
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