Vol. 11, Issue 9 (2022)

Author(s):
Bhavna Sinha and Sobita Simon

Abstract:
Sarpagandha (Rauvolfia serpentina) roots contains many important alkaloids, like Ajmalicine, Ajmaline, isoajmaline, rauvolfinine, reserpine, serpentine, rescinnamine, tetraphylicine, yohimbine and 3 epi-yohimbine. Different genera of fungi cause infection to the foliage and roots of Sarpagandha, makes responsible for decreased biochemical productivity. The foliar parts causing light brown to dark brown, roundish-oval to irregular spots were observed in plants. Microscopic observation of infected leaf samples revealed association of foliar pathogen namely Alternaria alternata. The pot experiment was conducted in the Department of Plant pathology, SHUATS, in kharif season 2021-22, it was analysed using C.R.D (Completely Randomized Design) with seven treatments and four replications of each treatment. The treatments were Control (Untreated) T₀, Bavistin (Treated check) T₆ (2%), Clove oil (2%) T₁, Neem oil (2%) T₂, Lemongrass oil (2%) T₃, Clove oil (1%) + Neem oil (1%) T₄, Clove oil (1%) + Lemongrass oil (1%) T₅ was taken thrice as foliar spraying accordingly. Observations were recorded at successive stage of plant growth on various parameters such as percent disease incidence, plant height and root mass. Evaluation was done for the effect of three essential oils, their combinations and one fungicide (treated check) in vivo against Alternaria alternata causing leaf spot of Sarpgandha. The evaluation results shows that all the treatments was found significantly reduced the disease incidence as compared to control. Increased the growth parameters was recorded. It was recorded in Neem oil minimum percent disease incidence (13.23%), followed by Clove oil+ Neem oil (14.2%), Clove oil + Lemongrass oil (20.3%), Clove oil (20.6%) and Lemongrass oil (20.6%). Whereas, Clove oil + Neem oil were recorded the maximum plant height (29.4 cm).