Vol. 10, Issue 9 (2021)

Author(s):
Pradip Sarkar, Tushnima Chaudhuri, Susamoy Kundu, Ankita Roy, Jayanta Saha and BN Panja

Abstract:
The research was conducted to find out effective plant extract based formulations as safe alternative to synthetic chemicals against eight fungal plant pathogens viz. Colletotrichum capsici, Colletotrichum musae, Colletotrichum gloeosporoides, Alternaria alternata, Diplodia natalensis, Fuasarium oxysporum, Phomopsis vexans & Rhizoctonia solani. To achieve the objective, different parts of commonly available plants viz. ferns, Clerodendrum, Polyalthia and Glycosmis were selected. Hexane, chloroform and methanol extract of plant materials of selected plants were formulated with light solvent naphtha and surfactant to get a 20% EC formulation. Results of in vitro studies revealed that Polyalthia old leaf extract showed highest mean per cent inhibition of radial growth (54.62%) over control irrespective of fungi tested and solvent used. Whereas, standard fungicide carbendazim showed 50.27% mean radial growth inhibition. Among the eight test fungi Rhizoctonia solani showed maximum (65.17%) sensitivity towards plant extracts whereas, it was least in case of Alternaria alternata (29.07%) in terms of mean per cent radial growth inhibition irrespective of treatments. Effect of the plant extract against three post-harvest pathogens were almost comparable irrespective of solvent used whereas there was a clear increasing trend of bio-activity of plant extract against Rhizoctonia solani while using solvent with increasing polarity for extraction. In case of Diplodia natalensis where methanol extract of selected plant material showed better mean per cent inhibition of radial growth (52.85%) than chloroform extract (46.63%) and hexane extract (39.40%) respectively.