First report of stemphylium leaf blight of onion caused by Stemphylium vesicarium in Egypt.

摘要

In 2004, onion (Allium cepa cv. Giza 6) plants in several commercial fields in upper Egypt exhibited symptoms of blight on the leaves and seed-stalk. Initial symptoms on leaves consisted of tip necrosis followed by small white and/or large purple spots. A fungus was consistently isolated from the infected tissue and identified as Stemphylium vesicarium based on its morphological characteristics. Upon conducting pathogenicity tests, the fungus was reisolated from the lesions of the inoculated plants, but not from tissues of any of the control plants inoculated with sterile water only. This is thought to be the first report of the pathogen in Egypt..