In vitro and in vivo field efficacy of different fungicides against Alternaria brassicae (Berk.) sacc. causing Alternaria leaf spot of cauliflower

Abstract

The Alternaria leaf spot caused by A. brassicae (Berk.) Sacc is one of the destructive disease of Cauliflower in Konkan region of Maharashtra. In the present study, bio efficacy of seven fungicides tested under in vitro conditions against the pathogen. Among that, Mancozeb 75% WP (0.25 %) was completely inhibited the growth of the test fungus. It was followed by Propiconazole 25% EC (0.1%) which showed 96.29 per cent inhibition of the test fungus and was at par with Mancozeb. No sporulation was observed in Mancozeb 75% WP, Propiconazole 25% EC and Difenconazole 25% EC. Among the different fungicides tested under field conditions, all the fungicidal treatments were significantly superior over control after last spray. The treatment Mancozeb 75% WP was the most effective as it recorded minimum disease incidence (28 %). It was followed by Azoxystrobin 23% EC which recorded 29 % disease incidence.