Bacterial Stem Rot of Greenhouse Tomato: Etiology, Spatial Distribution, and the Effect of High Humidity

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Abstract
An outbreak of stem rot of the tomato cultivar CR-6 in some Essex County greenhouses in Ontario [Canada] was caused by Erwinia carotovora ssp. carotovora. The disease occurred about the time of the first fruits harvest, or later, inthe spring crop. Disease incidence was greater in rows, under the roof-gutters than elsewhere in the greenhouse. The results of two-directional doublet, runs and chain analyses of a 9,600-plant stand showed a nonrandom distribution of disease plants, with marked clumping along the rows. Stem rot and pitch disintegration developed more intensivley in the affected plants under high humidity.