Archives of Phytopathology and Plant Protection (2005) 38, 185-192

V.K. Satya, R. Radhajeyalakshmi, K. Kavitha, V. Paranidharan, R. Bhaskaran and R. Velazhahan (2005)
In vitro antimicrobial activity of zimmu (Allium sativum L. × Allium cepa L.) leaf extract
Archives of Phytopathology and Plant Protection 38 (3), 185-192
Abstract: The fungitoxic effect of various medicinal plants belonging to different families was evaluated in vitro on Rhizoctonia solani, the rice sheath blight pathogen. Of the various plant extracts, the leaf extract of zimmu (Allium cepa × Allium sativum) showed the maximum antifungal activity against R. solani and recorded an inhibition zone of 12 mm. The leaf extract of zimmu was also effective in inhibiting the growth of other agronomically important fungal and bacterial pathogens viz., Aspergillus flavus, Curvularia lunata, Alternaria solani, Xanthomonas oryzae pv. oryzae, Xanthomonas campestris pv. malvacearum and Xanthomonas axonopodis pv. citri. The antimicrobial compound was dissoluble in methanol and the methanolic extract showed the absorption maxima at 210 nm and 230 nm. Phenolic compounds were present in greater amounts in methanol extract of zimmu. TLC analysis showed the appearance of two blue spots at Rf = 0.65 and Rf = 0.90. The compounds eluted at Rf = 0.65 and Rf = 0.90 by preparative TLC exhibited strong antifungal activity against R. solani.
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Link to article at publishers website
Database assignments for author(s): Rethinasamy Velazhahan

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Rhizoctonia solani	Rice (Oryza)	India
	Aspergillus flavus (plant/storage disease)
	Xanthomonas oryzae
	Alternaria solani
	Xanthomonas citri subsp. malvacearum
	Curvularia lunata
	Xanthomonas citri