Pathogenic variability of Colletotrichum sp. from chilli anthracnose and their tolerance to carbendazim

Farzana Haque Tumpa,Jannat Muhtarima,Md Atiqur Rahman Khokon,Md Rashidul Islam

doi:10.3329/jbau.v16i3.39411

Farzana Haque Tumpa, Jannat Muhtarima + Show 2 more

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https://doi.org/10.3329/jbau.v16i3.39411

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Abstract

Twelve isolates of Colletotrichum capsici and Colletotrichum gloeosporides were isolated from anthracnose infected chilli fruits from different areas of Mymensingh. Isolated pure fungal isolates were grouped on the basis of their morphological characters viz. colony color and compactness, size, shape and number of conidia. The white colored isolates were identified as C. capsici and showed faster growth on PDA medium. In contrast, grey colored fungal isolates were identified as C. gloeosporides and comparatively slow growth on PDA medium. All the fungal isolates were pathogenically active and developed typical symptoms on both green and ripe fruits of chilli. The isolates of C. capsici collected from Kalibari showed the highest infection (74.99%) on fruit surface followed by Muktijoddhar bazar (61.83%). Differential tolerance was observed as fungal growth was different against 0.05% and 0.1% carbendazim while 0.2% carbendazim was lethal against all fungal isolates. The results indicate that severity of anthracnose of chilli is different may be due to aggressiveness of fungal and their tolerance against common fungicide like carbendazim. J.Bangladesh Agril. Univ. 16(3): 417–423, December 2018

Highlights

Chilli (Capsicum annuum L.) is one of the most important spice crops belongs to the family Solanaceae grown widely in Bangladesh
The white colored isolates were identified as C. capsici and showed faster growth on PDA medium
Several researchers studied on anthracnose of chilli and reported that C. capsici and C. gloeosporioides are associated with anthracnose of chilli (Kim et al 1999)

Summary

Introduction

Chilli (Capsicum annuum L.) is one of the most important spice crops belongs to the family Solanaceae grown widely in Bangladesh. The average yield of dry chilli is 1,22,848 MT in 2009–2010 (BBS, 2011). This is quite low to meet up the spices requirement of Bangladesh. Chilli suffers from many diseases caused by fungi, bacteria, viruses, nematodes and due to abiotic stresses. Colletotrichum is one of the most important plant pathogens worldwide causing the economically important disease in a wide range of hosts including cereals, legumes, vegetables, perennial crops and tree fruits. Chilli infected by Colletotrichum usually develops under high humid conditions when rain occurs after the fruits have started to ripen reported to loss up to 84 % (Thind and Jhooty, 1985)

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