Effect of some plant extracts and essential oils of medicinal and aromatic plants on the incidence of pelargonium root rot [electronic resource].

Includes references.

Pelargonium (Pelargonium graveolens L.) is one of the most important medicinal and aromatic crops in many parts of the world as well as in Egypt. The complex disease, root-rot is considered one of the most destructive soil borne diseases attacking this crop. The most effective inoculum level of the tested fungi was 5 % VN. The combinations between Fusarium oxysporum + Rhizoctonia solani and Macrophomina phaseolina + R. solani resulted in the highest synergistic effect, recording tlle highest incidence of pelargonium root rot WIder greenhouse conditions. Under Laboratory conditions, garlic and onion extracts, and essential oils of basil, clove and thyme significantly decreased the mycelial growth of the tested fungi. Greenhouse studies proved that the essential oils of basil and clove significantly decreased the incidence of pelargonium root rot. Field experiment proved the same trend. The essential oil of clove resulted in the lowest infection percentage and disease severity, while it resulted in the highest yield of hero and oil percentage compared with the essential oil of basil and control treatments.

Summary in Arabic.

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