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KMID : 1160220140420010066
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Mycobiology
2014 Volume.42 No. 1 p.66 ~ p.72
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Occurrence of Root Rot and Vascular Wilt Diseases in Roselle (Hibiscus sabdariffa L.) in Upper Egypt
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Hassan Naglaa
Shimizu Masafumi
Hyakumachi Mitsuro
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Abstract
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Roselle (Hibiscus sabdariffa L.) family Malvaceae is an important crop used in food, cosmetics and pharmaceuticsindustries. Roselle is cultivated mainly in Upper Egypt (Qena and Aswan governorates) producing 94% of total production. Rootrot disease of roselle is one of the most important diseases that attack both seedlings and adult plants causing serious losses incrop productivity and quality. The main objective of the present study is to identify and characterize pathogens associated withroot rot and wilt symptoms of roselle in Qena, Upper Egypt and evaluate their pathogenicity under greenhouse and fieldcondition. Fusarium oxysporum, Macrophomina phaseolina, Fusarium solani, Fusarium equiseti and Fusarium semitectum wereisolated from the natural root rot diseases in roselle. All isolated fungi were morphologically characterized and varied in theirpathogenic potentialities. They could attack roselle plants causing damping-off and root rot/wilt diseases in different pathogenicitytests. The highest pathogenicity was caused by F. oxysporum and M. phaseolina followed by F. solani. The least pathogenic fungiwere F. equiseti followed by F. semitectum. It obviously noted that Baladi roselle cultivar was more susceptible to infection with alltested fungi than Sobhia 17 under greenhouse and field conditions. This is the first report of fungal pathogens causing root rotand vascular wilt in roselle in Upper Egypt.
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KEYWORD
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Fusarium oxysporum, F. solani, Hibiscus sabdariffa L., Macrophomina phaseolina, Root rot/wilt
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