New bacterial leaf spot of pelargonium in Florida (US)
Since 1988 in Florida (US), unusual symptoms have been observed on pelargonium grown under glass. Diseased plants presented oval to irregularly shaped lesions (4-6 mm diameter), zonate, shotholed and surrounded by a broad band of chlorosis. Studies showed that the causal agent is a bacterium belonging to the genus Acidovorax, which appears to be a distinct species from A. avenae and A. konjaci. When pelargonium strains and representative strains of A. avenae subsp. citrulli, A. a. subsp. cattleyae, A. a. subsp. avenae, A. konjaci and A. facilis were inoculated on pelargonium plants, only the pelargonium strains induced significant leaf spot symptoms and defoliation.
Sources
Jones, J.B.; Bouza, H.; Stall, R.E.; Hodge, N.C.; Roberts, P.D. (1996) A new Acidovorax species causing bacterial leaf spot of geranium.
Abstract (378A) of a paper presented at the APS/MSA Joint Annual Meeting, Indianapolis (US), 1996-07-27/31.
Phytopathology, 86(11), Supplement, S42-S43.
Simone, S.W.; Cullen, R.E.; Hodge, N.C. (1996) A new leaf spot disease of geranium caused by Acidovorax sp.
Abstract (442A) of a paper presented at the APS/MSA Joint Annual Meeting, Indianapolis (US), 1996-07-27/31.
Phytopathology, 86(11), Supplement, p S50.