Escape ofPeronospora tabacinaSpores from a Field of Diseased Tobacco Plants

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Abstract
Blue mold disease of tobacco is spread from field to field by wind-blown spores of the fungal pathogen, P. tabacina. Estimation of the number of spores likely to reach a distant field requires knowledge of the rate at which spores escape from an infected crop. Vertical profiles of spore concentration and wind speed above a small field of tobacco plants severely diseased with blue mold were measured on several days during the hours of peak spore release. The rate of spore escape derived from these measurements ranged from 1-7 spores/m2 per second. By means of a mathematical model, these results were used to estimate spore escape from more extensive plantings.

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