Pseudomonas aeruginosa WS-1 for biological control of leaf blight disease of Withania somnifera

Author： Maiti Chandan K. Sen Surjit Paul Amal Kanti Acharya Krishnendu

ISSN： 0323-5408

Source： Archives of Phytopathology and Plant Protection, Vol.45, Iss.7, 2012-04, pp. : 796-805

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Abstract

Withania somnifera (L.) Dunal, also known Indian ginseng is one of the most widespread tranquillizers tranquillisers used for the treatment of nervous disorders, intestinal infection, leprosy, and cancer; it also suffers a leaf blight disease caused by the fungus Alternaria dianthicola in various districts of South Bengal, India: Pseudomonas aeruginosa strain WS-1 isolated from the rhizosphere, showed both in vitro and in vivo antagonistic activity against the pathogen. The antifungal activity of the isolate has been found to be linked to theproduction of a siderophore, volatile substances (hydrocyanic acid), proteases and chitinases. Foliar application of a talc talc-based formulation of P. aeruginosa strain WS-1 to field grown W. somnifera reduced disease severity by 80% compared to non-treated control.

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