Colletotrichum atramentarium (not C. gloeosporioides or ? C. phomoides as frequently stated) was found to be the predominant cause of ripe fruit rot in canning tomatoes in Ontario and the adjoining regions of the United States. Infection by the organism occurred readily on all parts of the plant including the fruit. Development of the organism in the plant ceased, however, after a very brief initial period of rapid growth and remained latent until the surrounding host tissues became senescent.Latency in the fruit could be partially overcome by a period of low temperature storage and symptom expression thus obtained in green fruit. The ability of the organism to establish itself in the xylem vessels of the root and stem was demonstrated. Here again, however, rapid development of the organism was of only short duration.The significance of these findings is discussed and attention is drawn to a number of features of the disease that require further clarification.

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