Seaweed extracts control the leaf spot disease of the medicinal plant Gymnema sylvestre

Chinnadurai Sreenath Kumar; Dronamraju V L  Sarada and Ramasamy Rengasamy  nbsp

doi:10.17485/ijst/2008/v1i3/8

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Seaweed extracts control the leaf spot disease of the medicinal plant Gymnema sylvestre

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2008/v1i3/8

Year: 2008, Volume: 1, Issue: 3, Pages: 1-5

Original Article

Seaweed extracts control the leaf spot disease of the medicinal plant Gymnema sylvestre

Chinnadurai Sreenath Kumar, Dronamraju V.L. Sarada and Ramasamy Rengasamy*

Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai - 600 025, India.

*Author for the correspondence:
Ramasamy Rengasamy
Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai - 600 025, India
E-mail: [email protected]

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Antimicrobial screening of 12 different seaweeds extracts namely Chaetomorpha antennina, Dictyota dichotoma, Enteromorpha flexuosa, Laurencia obtusa, Gracilaria corticata, Gracilaria verrucosa, Grateloupia lithophila, Padina boergesenii, Sargassum wightii, Turbinaria conoides, Halimeda tuna and Ulva lactuca was carried out in vitro. The crude extracts were tested against the phytopathogenic bacteriumPseudomonas syringae causing leaf spot disease of the medicinal plant Gymnema sylvestre. The methanolic extracts of Sargassum wightii showed maximum activity followed by ethyl acetate compared to that of other organic solvent- extracts. Thus, this investigation throws fresh light on the appropriate usage of solvent extraction method in preparing potent biopesticide.

Keywords: Gymnema sylvestre, seaweed extracts, plant pathogenic bacteria, leaf spot disease, pathogenicity, Pseudomonas syringae