Evaluation of Bio-efficacy and Phytotoxicity of Noval Fungicides against Purple Blotch of Onion

Abstract

An experiment for the management of purple blotch of onion (Allium cepa L.) caused by Alternaria porri (Ellis) was carried out in Hanumanamatti research farm, College of Agriculture, Hanumanamatti, University of Agricultural Sciences, Dharwad, during 2017-18 and 2018-19.  There were three fungicides combinations tested in vivo, i.e.  Fluxapyroxad 250 g/L  + Pyraclostrobin 250 g/L  500 SC at 75, 100 and 125 a.i, along with individual molecules Pyraclostrobin 20% WG at 100 a.i, Fluxapyroxad 300 g/L SC at 62.5 a.i and Difenconozole 25% EC at 25 g a.i/100 litre of water and Mancozeb 75% WP 1125-1500 g against the purple blotch disease of onion. Out of the seven different fungicides combination or individual molecules, application of Fluxapyroxad 250 g/L  + Pyraclostrobin 250 g/L  500 SC  @ 200 mL/ha has significantly decreased the purple blotch of onion disease. Fluxapyroxad 250 g/L + Pyraclostrobin 250 g/L 500 SC @150 mL/ha was found safer to onion crop without causing any type of phytotoxicity effect.