A 9-year monitoring study of diseases on potato seed tubers imported to Israel |
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Authors: | Leah Tsror A Nachmias Orly Erlich M Aharon M C M Pérombelon |
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Institution: | 1. Agricultural Research Organization, Gilat Experiment Station, 85280, M.P. Negev, Israel 2. Scottish Crop Research Institute, Dundee DD2 5DA, Invergowrie, Scotland, UK
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Abstract: | Potato seed tubers are imported annually to Israel from northern Europe. Although the seed is registered as certified, a survey
carried out over a 9-year period indicated that most lots were affected by latent or active bacterial and fungal infections.
Latent infection byErwinia carotovora subsp.atroseptica, the causal agent of blackleg, at a level of 103 cells/g peel, was present in 30% of the lots in most years. Black scurf caused byRhizoctonia solani was present in 20–70% of the imported lots, with a moderate to high level of infection in all years except 1985. In contrast,
although many lots were affected by powdery scab, common scab, and Fusarium dry rot in most years, disease incidence within
lots was generally low. The gangrene pathogen (Phoma exigua) was rarely detected. The survey findings are of marked importance, due to the extensive use of soil fumigation in Israeli
agriculture. |
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Keywords: | Erwinia carotovora black leg Rhizoctonia solani black scurf Spongospora subterranea powdery scab Streptomyces scabies common scab Fusarium dry rot Phoma exigua gangrene |
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