Vol. 11, Special Issue 11 (2022)

Anthracnose of avocado caused by Colletotrichum ggloeosporioides is the most widespread and serious disease affecting leaves, flowers and young fruits in wet and humid conditions. In the present experiment, six fungicides viz., Azoxystrobin 23% SC, Propiconazole 25% EC, Tebuconazole 25.9% EC, Mancozeb 50% WP, Chlorothalonil 75% WP and Tebuconazole 50% WG + Trifloxystrobin 25% WG were evaluate their efficacy against the C. gloeosporioides at different concentrations by poisoned food technique and the antagonistic activity of three Trichoderma strains viz., T. harzianum, T. longibrachiatum and T. koningii were tested against C. gloeosporioides using dual culture technique in in vitro. Among all the fungicides evaluated, Tebuconazole at 0.1% concentration was the most effective as it completely inhibited the mycelial growth of C. gloeosporioides. It was followed by Propiconazole (inhibition-89.26%). The combination formulation ranked third (77.22%) which was trailed by Azoxystrobin (59.26%). Mancozeb (54.26%) was superior to Chlorothalonil (48.88%). Among three strains of Trichoderma evaluated, T. harzianum caused maximum inhibition 66.27% and it was followed by T. longibrachiatum (61.51%) and T. koningii (57.86%).