Barn Mold of Burley Tobacco Caused by Botryosporium longibrachiatum. T. R. Anderson, Plant Pathologist, Agriculture Canada, Research Station, Harrow, Ontario N0R 1G0. T. W. Welacky, Tobacco Agronomist, Agriculture Canada, Research Station, Harrow, Ontario N0R 1G0. Plant Dis. 67:1158-1159. Accepted for publication 2 July 1983. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1983. DOI: 10.1094/PD-67-1158.

In 1982, barn mold of burley tobacco caused by Botryosporium longibrachiatum caused moderate damage at several locations and severe damage at one location in Ontario, Canada. Lesions and sporulation of the fungus occurred first on the midribs and laminae of lower leaves. Eventually, the mold was evident on all leaves. Based on the pattern and extent of mold development, it was concluded that inoculum of B. longibrachiatum was probably present on the crop before harvest. Secondary infection and humid weather contributed to the damage. Botrytis cinerea was present in most curing barns but sporulation was confined to leaf midribs and plant stems.