Stem Rot, a new disease of Valeriana jatamansi in the Sub-Himalayan zone of Darjeeling district of West Bengal, India

Publication Date : 29/02/2016


Author(s) :

Sibdas Baskey , Satyajit Hembrom , Sajeed Ali , Binoy Raj Sharma , Biplab Tudu , Soumendra Chakraborty.


Volume/Issue :
Volume 2
,
Issue 2
(02 - 2016)



Abstract :

A new stem rot disease is found to occur naturally on Valeriana jatamansi plants in greenhouses at Hill Campus of U.B.K.V. Kalimpong,Darjeeling. In order to identify its pathogen, we conducted a fungal series of isolation and purification, plant reinoculation, and ascus and ascospore induction from the sclerotia. The isolate caused typical water-soaked lesions after reinoculation and produced sclerotia both on Valeriana plants and culture medium plates, and the sclerotia could be induced to produce discal apothecia and 8 binucleate ascospores per ascus. These disease symptom and fungal morphology data revealed that the fungus Sclerotinia sclerotiorum (Lib.) de Bary was the pathogen for valeriana stem rot. Taking all these data together, we concluded that the fungus that caused the valeriana stem rot is S. sclerotiorum (Lib.) de Bary. This is the first report that valeriana jatamansi is naturally infected by S. sclerotiorum. Key Word: Medicinal plant, Valeriana jatamansi, Stem rot, Sclerotinia sclerotiorum ,Disease, Identification


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