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Department of Botany, College of Science, King Saud University, Riyadh, Saudi Arabia

ABSTRACT

The postharvest diseases of some vegetables in the two main markets of Riyadh were studied. Fungi isolated from their respective hosts were: Alternaria alternate Drechslera spicifera, Epicoccum purpurascens and Trichocladium asperum from egg plant fruits; Alternaria alternate and Botrytis cinerea from tomato fruits; Alternaria alternata from potato tubers; A. alternate and Xylohypha sp. from squash fruits; Botrytis sp. and Cladosporium cladosporioides from red pepper fruits; Alternaria alternata, Botrytis sp. and Fusarium sp. from broad beans, and Botrytis sp., Alternaria radicina and Fusarium sp. from okra fruits. Pathogenicity tests confirmed that the isolated fungi were pathogenic to their respective hosts and that locality had no effect on isolation frequency of these pathogens. Different rot symptoms are also described. Temperature and pH experiments showed that optimum temperature and pH value varied for different isolates of the fungi.