Author(s):

Kota Chakrapani, Bireswar Sinha, W. Tampakleima Chanu, Tusi Chakma and Tokmem Siram

Abstract: Rice (Oryza sativa. L) is the world's second most important cereal crop. It is the staple food crop for most of the people of south, south-east and eastern Asia where 90 per cent of the world’s rice is produced and consumed. Among fungal diseases, sheath blight, caused by multinucleate, ubiquitous pathogen Rhizoctonia solani Kuhn (Teleomorph: Thanatephorus cucumeris Donk), is an important fungal disease of rice which ranks only after blast and often rivalling it. The potential loss due to sheath blight alone in India has been up to 51.3%. In this study an attempt was made to investigate invitro antifungal efficacy of botanicals viz., Garlic (Allium sativum), Marigold (Tagetes spp.), Eucalyptus (Eucalyptus globules), Turmeric (Curcuma longa), Ginger (Zingiber officinale), Onion (Allium cepa), and Tulsi (Ocmium spp.) by the technique of food poisoning. The pathogen Rhizoctonia solani was allowed to grow on Potato Dextrose Agar amended with various botanical extract of concentrations 2.5, 5.0 and 10 per cent respectively. The effect of botanical extracts on mycelial growth inhibition was recorded after 72 hours of incubation. Among the botanicals used garlic showed cent of mycelial inhibition followed by Ginger (80.00%), Turmeric (78.51%), (Marigold (76.29%), and Eucalyptus (75.55%). The least mycelial growth inhibition was showed by Onion and Tulsi with (37.77%) respectively. On the basis of available information and preliminary studies, it is suggested that Ginger can be suggested for management of sheath blight disease of rice caused by Rhizoctonia solani.

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