SUSCEPTIBILITY OF SOME TOMATO CULTIVARS TO BACTERIAL CANKER AND SPOT DISEASES AND THE ROLE OF SEEDS IN PATHOGEN TRANSMISSION*

Document Type : Original Article

Authors

1 Department of Plant Pathology, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Cairo.

2 Department of Horticulture, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Cairo.

3 Department of Horticulture, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Cairo

Abstract

Bacterial canker caused by Clavibacter michiganensis subsp. michiganensis
(Smith) and bacterial spot caused by Xanthomonas campestris pv. vesicatoria
(Doidge) Dye have become important diseases of tomato in Egypt. The present work
was planned to evaluate the reaction of different tomato cultivars and the role of
seeds to transmit both pathogens. Cultivars of Dora, Flora-Dade, KTM141, Money
Maker, Niagra, Super strain B hybrid and GS12 were moderately resistant to both
diseases, but Castle rock, Peto 86 and Super strain B cultivars were susceptible.
However, Castle rock, Peto 86, Super strain B and Niagra cultivars were highly
susceptible for bacterial canker than spot disease. Using the Liquid assay method, C.
michiganensis subsp. michiganensis bacterium could be detected in seeds of
cultivars Dora, KTM141, Niagra and Super strain B hybrid, but X. campestris pv.
vesicatoria was detected on seeds of cultivars GS12, Peto 86 and Super Marmand.
However, both bacterial pathogens were not detected in seeds of all cultivars, except
GS12, when direct planting method on selective media was used. In an in vivo assay,
bacterial canker has developed more than bacterial spot disease on tomato seedlings
produced from non-treated seeds. Bacterial canker has developed on all tested
cultivars at different frequencies. Transmission of both pathogens occurred at high
frequency by seeds of cultivars Niagra and Dora, however bacterial spot was not
borne on samples of other tomato cultivars

Keywords

Arab Universities Journal of Agricultural Sciences
Volume 13, Issue 3
September 2005
Pages 817-826

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