Abstract
Two isolates, 365-4 and 1096, and the five races of Venturia inaequalis were used to investigate the effects of various factors on conidium production on filter paper cylinders standing in liquid synthetic media. The isolates and races varied significantly in conidium production and there was a large variation among tests done on different days. Varying the concentration of conidia used as inoculum and the age of cultures from which the inoculum was derived did not affect conidium production. Making single conidium transfers every 6 mo did not consistently enhance conidium formation in all isolates and races. Conidium yields were optimum between 16 and 19 days at a temperature of 16 C. The concentrations of glucose, nitrogen, KH2PO4, and MgSO4 required for optimum conidium production were not critical.
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