Abstract
A leaf spot has been observed for several years on nursery-grown blueberry cuttings throughout southern New Jersey. A bacterium that produced a white-pigmented colony on yeast extract-dextrose-calcium carbonate agar and was nonfluorescent on King's B agar was repeatedly isolated from lesions on diseased leaves collected from various locations. The bacterium was identified as Pseudomonas andropogonis using diagnostic tests, Biolog, and fatty acid analysis. Infiltration of bacterial suspensions at concentrations of 10 6 and 10 8 cells per ml into leaves of 3- to 5-year-old potted plants and 1-year-old hardwood cuttings resulted in the appearance of necrotic lesions similar to leaf spot symptoms observed on plants in the field. The bacterium was reisolated from the necrotic lesions produced by these inoculations. Inoculation of blueberry isolates into cranberry leaves also caused pathogenic responses. This is believed to be the first report of a bacterial leaf spot on Vaccinium species.
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