Antifungal Activity and Seasonal Variation of Green Alga (Ulva lactuca ) Extracts

Rasha E. Selim, Soad M. Ahmed, Saad R. El-Zemity, Sami Sh. Ramses, Yasser T. A. Moustafa


The present study was undertaken to explore the inhibitory effect of seaweed extracts of Ulva lactuca (green alga) with five solvents (methanol, Ethanol, Methylene chloride, chloroform and hexane) and water at different concentrations of (100, 200, 250, 500, 1000, 1500, 2000, 4000 8000 ppm) along with control against the mycelial growth of Fusarium solani, Rhizoctonia solani, Sclerotinia sclerotiorum, Alternaria solani, Phytophthora infestanse and Botrytis cinerea by poison food technique. Result revealed that extract of Methanol showed the highest antifungal activity against all the tested fungi. While water extract showed a moderate antifungal activity against all the tested plant pathogenic fungi. Phytophthora infestans was most sensitive than the other tested fungi to all solvent extracts of Ulva lactuca. The results also showed that the highest antifungal activity was recorded in winter season while the lowest one was in summer. GC-MS analysis of methanolic extract of Ulva lactuca was also recorded.


Ulva lactuca (green alga), antifungal activity, seasonal variation, Chemical analyses, Gas chromatography- mass spectrometry

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