Abstract
Abstract There was seasonal variation in the sugar concentration in xylem sap extracted from Salix fragilis at monthly intervals. Sucrose was the predominant sugar and showed the greatest variation in concentration over the study period. The dry weight of fungal mycelium obtained from growth in sap extracted at monthly intervals was significantly correlated with sucrose concentration. Growth of the fungus in xylem tissue however, was not correlated with the sugar content of extracted sap. There was little difference in growth of Chondrostereum purpureum in inoculated excised twigs incubated in the field and inoculated twigs in situ. Growth was greater in corresponding batches of twigs incubated in the laboratory. The role of temperature and sap constituents in the determination of the susceptibility of trees to C. purpureum is discussed.
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