In vitro Evaluation of Botanical Extracts against Mycelial Growth of Alternaria solani

An experiment was conducted at the laboratory of the Department of Plant Pathology, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, Uttar Pradesh. To test the efficacy of different treatments viz., Neem (Azadirachta indica), Onion (Allium cepa), Garlic (Allium sativum), Castor (Ricinus communis), Amaltas (Cassia fistula), Henna (lawsonia inermis), Madar (Calotropis gigantea) against Alternaria solani under in vitro condition. Botanicals were tested through the poisoned food technique at 5% and 10 % concentrations and 168 hours of incubation. The Minimum radial growth of observed in Neem (Azadirachta indica) seed kernel extract @ 5% (14.8mm) followed by Henna (lawsonia inermis) leaf extract @ 10% (43.36mm), Amaltas (Cassia fistula) leaf extract @ 10% (67.13mm), Castor (Ricinus communis) leaf extract @ 10% (67.6mm), Madar (Calotropis gigantea) leaf extract @ 10% (69.6mm), Onion (Allium cepa) extract @ 10 % (70.8mm), Garlic (Allium sativum) extract @ 10 % (72.2mm) as compared to Control (89.4mm) untreated check.