ISHS Acta Horticulturae 808: II International Symposium on Tomato Diseases
PITH NECROSIS OF TOMATO IN RUSSIA |
| Authors: | E.S. Pekhtereva, K.P. Kornev, E.V. Matveeva, V.A. Polityko, N.I. Budenkov, A.N. Ignatov, N.W. Schaad |
| Keywords: | tomato, pith necrosis, bacterial canker |
| Abstract:
Tomato (Solanum esculentum), a major vegetable crop in Russia, is affected by several bacterial pathogens causing similar disease, known as pith rot. The disease is harmful in glasshouses and can be caused by Pseudomonas corrugata, P. mediterranea, P. viridiflava, and P. fluorescens. A survey of tomato plants in Russian Federation conducted in 2006 revealed the widespread presence of pith rot disease in North-west, Central, and South-eastern regions of Russia. One hundred two samples of diseased plants were collected in glasshouses. Isolations were made from plants with early symptoms of wilting from vessels above the ground level. Thirty five strains isolated from samples (58% of tested sites) presumptively identified as P. corrugate. The pathogenicity and physiologic properties of the strains were highly variable. Besides P. corrugate, 110 strains of other pseudomonades were isolated from the tested samples. Biochemical properties of the strains were highly diverse. However, almost 40% of the strains were recognized as P. viridiflava when others were assumed to be different biotypes of P. fluorescens. The bacteria were highly aggressive on tomato seedlings following inoculation by stem clipping. | |
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