Occurrence of Root Rot and Vascular Wilt Diseases in Roselle (Hibiscus sabdariffa L.) in Upper Egypt

Abstract

Roselle (Hibiscus sabdariffa L.) family Malvaceae is an important crop used in food, cosmetics and pharmaceutics industries. Roselle is cultivated mainly in Upper Egypt (Qena and Aswan governorates) producing 94% of total production. Root rot disease of roselle is one of the most important diseases that attack both seedlings and adult plants causing serious losses in crop productivity and quality. The main objective of the present study is to identify and characterize pathogens associated with root rot and wilt symptoms of roselle in Qena, Upper Egypt and evaluate their pathogenicity under greenhouse and field condition. Fusarium oxysporum, Macrophomina phaseolina, Fusarium solani, Fusarium equiseti and Fusarium semitectum were isolated from the natural root rot diseases in roselle. All isolated fungi were morphologically characterized and varied in their pathogenic potentialities. They could attack roselle plants causing damping-off and root rot/wilt diseases in different pathogenicity tests. The highest pathogenicity was caused by F. oxysporum and M. phaseolina followed by F. solani. The least pathogenic fungi were F. equiseti followed by F. semitectum. It obviously noted that Baladi roselle cultivar was more susceptible to infection with all tested fungi than Sobhia 17 under greenhouse and field conditions. This is the first report of fungal pathogens causing root rot and vascular wilt in roselle in Upper Egypt.

Efficacy of Essential Oils From Three Medicinal and Aromatic Plants in Controlling Wilt Disease of Roselle (Hibiscus Sabdariffa L.)

“…Results of this study are in agreement with those reported by (Hassan et al, 2014 andBoulanger et al, 1984).…”

“…According to Ploetz (2000) among the species of Fusarium oxysporum, there are pathogenic and nonpathogenic isolates that cannot be distinguished morphologically. Fusarium oxysporum, F. solani and M. phaseolina are the causal pathogens of wilt and root rot diseases in roselle (Hibiscus sabdariffa L.), endanger roselle production wherever this crop is cultivated extensively (Hassan et al, 2014). Boulanger et al (1984) found that F. oxysporum causes infection to the young plants of H. sabdariffa, the pathogens can damage the crop.…”

Hypolipidemic and Hypocholesterolemic Effect of Roselle (<i>Hibiscus sabdariffa</i> L.) Seeds Oil in Experimental Male Rats

“…In Qena governorate, the total planted area is around 1,150 ha 45.83 which either recently reclaimed area 966 ha or the old soil of the valley 189 ha . About 1,353 tons out of 2,648 tons 51.1 of the total production of dry yield of roselle are produced by Qena governorate 11 . The amounts of roselle seeds produced that do not use for recultivation process are lacking economic value 12 .…”

Soil Microbial Community Development in a Cherry Replant Site

“…vasinfectum causing wilt in cotton [31]. Fusarium species as pathogens could result in wilt disease in Pisum sativum and roselle plants, with damping-off and root rot wilt diseases [32,33]. Moreover, recent findings indicated F. oxysporum caused root and crown rot on sweet cherry (Prunus avium) in British Columbia.…”