Incidence of root-rot and wilt disease complex of olive trees in New Valley Governorate in Egypt and its control) [electronic resource].

Includes reference.

Root rot and wilt disease complex was detected in different olive tree orchards at El-Kharga, Paris, Eldakhla and EI-Faraftah oases of the New Valley Governorate. Percentage of disease incidence and severity on olive trees in surveyed districts were differed. The average percentage of disease incidence and severity of root rots and wilt disease in surveyed districts were 27.7-54.1% and 35.460.3%, respectively. The most frequent isolated fungi from rotted roots of olive trees were Fusarium oxysporum, F. solani, F. moniliforme, F. equiseti and Rhizoctonia solani, while Macrophomina phaseolina, Cylindrocarpon sp., Acremonium egyptina, Chaetomium olivaceum and Nigrospora oryzae were isolated in less frequency. Frequency of the isolated fungi varied between locations. Fusarium oxysporum was most frequent at all locations, followed by F. solani and R solani. All the tested fungi were pathogenic to olive transplants, Fusarium oxysporum, F. solani and Rhizoctonia. solani caused the highest root rots incidence and severity.

Summary in Arabic.

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