The Present Investigation was carried out at Central Research Field of the Department of Plant Pathology, SHUATS, Prayagraj (U.P.) during Rabi 2019-20 cropping season to ascertain the Eco-friendly management of Alternaria porri (Ellis) causing purple blotch of onion (Allium cepa L.). Efficacy of different essential oils & bio-agents was evaluated on different growth and yield parameters of onion crop. Maximum plant height @ 30 DAT (13.20 cm), 60 DAT (37.27 cm), 90 DAT (59.28 CM), number of leaves @ 30 DAT (3.90),60 DAT (7.70), 90 DAT (10.73), neck thickness at maturity (1.49 cm), yield per ha...