Vol. 11, Issue 12 (2022)

Author(s):
Nilesh V Chaure, MS Joshi, PP Patil, Shreyas S, VD Patil and PR Adsul

Abstract:
Anthracnose of avocado caused by Colletotrichum gloeosporioidesis the most widespread and serious disease affecting leaves, flowers and young fruits in wet and humid conditions. In the present experiment, eight different culture media viz., Potato dextrose agar (PDA), Oat meal agar (OMA), Martin’s agar medium (MA), Czapek’s dox agar (CDA), Richard’s agar medium (RA), Sabouraud’s dextrose agar (SA), Conns agar medium (CA) and Asthana and Hawkers agar (AHM) medium were used for morphological and cultural studies of the C. gloeosporioidesand 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 against the C. gloeosporioides at different concentrations by poisoned food technique in in vitro. Among all the media the growth on PDA was the maximum (90.00 mm) followed by OMA (77.67 mm), CA medium (75.33 mm), AHM medium (71.33 mm), MA medium (64.33 mm), SA medium (60.00) and CDA (57 mm). Least growth was observed on RA (55.67 mm) medium. Among the fungicide evaluated against C. gloeosporioides it is evident that the combination product (T₆) was numerically superior but statistically at par with T₅ and T₃. They were followed by T₂, T₁ and T_4. The least inhibition of the pathogen (49.63%) was caused by the sole contact fungicide- Mancozeb 50% WP at 0.1% concentration.