Studies on Leaf Blight Disease of Medicinal Plants (Piper longum, Tylophora indica, Hibiscus subdariffa) in Lower Gangetic Plains of West Bengal, India

Herbal medicinal plants are in great demand for their use food preparations, pharmaceuticals, cosmetic and beauty aids. But its availability is reduced every year due to attack of fungal disease i.e. leaf blight. Therefore an experiment was conducted gather the knowledge about future management aspect this disease. Here three viz, Piper longum, Tylophora indica Hibiscus subdariffa were planted observed throughout year. The characteristic symptoms along with causal organisms (Colletotrichum gloeosporioides- Sclerotianum rolfsii- indica, Fusarium sp- subdariffa) recorded. In seasonal study, lowest incidence severity month August higher June. showed less (15.33%) (6.11%) at initial stage (August) 67.33% & 42.46% respectively peak period (June). longum same times. All these pathogens isolated PDA medium from infected parts confirmed pathogenicity. cultural characteristics micrometric measurement spores recorded four different media (PDA, CZA, OMA MMA). Colletotrichum gloeosporioides found grow better (9.0 cm) high dry weight (1.47g) growth maize meal (4.8cm). Sclerotium rolfsii, highest radial (9.0cm) (1.48g) but no Czepek’dox. sp (8.3 (1.34 g) czepek dox agar (4.4cm).