Author(s):

Ramamoorthy R, R Kannan, N Rajinimala and KG Sabarinathan

Abstract: A new threat to peanut was first observed in Ananthapur district of Andhra Pradesh during 2000 in the form of a virus that causes Stem Necrosis disease. Characteristic symptoms were necrosis of the stem and terminal leaflets followed by death of the plant. The extract of virus samples collected from infected groundnut plants were sap inoculated on indicator plant, cowpea (Co-7) for multiplication and maintained at glass house condition. To know the host range of PSND, twenty weed and crop plants were sap inoculated with the virus. Among these Vigna mungo, Vigna radiata, Gossypium sp, Macrotyloma uniflorum, Cucumis sativus, Capsicum annuum, Solanum melangina, Amaranthus viridis, Trianthema portulacastrum and Euphorbia hirta produced mostly necrotic local lesion. whereas Sesamum indicum, Lablab purpureus, Crysanthymum indicum, Tagetes erecta were not infected by the virus and exhibited no symptoms.

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