ISHS Acta Horticulturae 808: II International Symposium on Tomato Diseases
OCCURRENCE OF BACTERIAL SPOT AND BACTERIAL CANKER OF TOMATO IN THE RUSSIAN FEDERATION |
| Authors: | A.N. Ignatov, K.P. Kornev, E.V. Matveeva, E.S. Pekhtereva, V.A. Polityko, N.I. Budenkov, N.W. Schaad |
| Keywords: | tomato, black spot disease, xanthomonads, bacterial canker, clavibacteria |
| Abstract:
Bacterial spot of tomato, caused in Russia by X. vesicatoria (Group B of X. campestris pv. vesicatoria) and X. gardneri (Group D) (Jones et al., 2004) and bacterial canker (C. michiganensis subsp. michiganensis) have become important diseases of tomato in the Russian Federation. Over 100 samples of tomato plants showing symptoms of bacterial canker or black spots were collected in the Moscow, Pskov, Tver, and Saratov regions, and the Republic of Tatarstan from June 2006 through June 2007. Symptoms on most plants consisted of black spots with yellow halos and wilting lesions surrounded by yellowing, normally with brown veins. Sixty-seven yellow-pigmented strains isolated from lesions were compared by phytopathologic, biochemical and molecular tests to reference strains of X. vesicatoria (NCPPB 422T, XV 153 and XV 938), X. gardneri (XV GA2), and C. michiganensis subsp. michiganensis (5213). Only a single pathogen was recovered from 24 samples for xanthomonads and from 38 samples for clavibacteria. Forty of 102 samples exhibited combined infection by both pathogens. Unexpectedly, some xanthomonads of both groups B and D were isolated together with C. michiganensis subsp. michiganensis from leaves with wilting symptoms only. | |
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