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VOL. 7, ISSUE 2 (2025)
Isolation and characterization of Colletotrichum gloeosporioides causing twister blight disease in onion
Authors
Sandhiya R, K Sowmya, M S Bhagavathi
Abstract
Onion (Allium cepa L.) is a bulbous
herb which belongs to the Alliaceae family, commonly referred to as the
"Queen of the Kitchen." It is a biennial crop that constitutes one of
the most important vegetables cultivated in India, having the highest export
value. The onion productivity was limited by numerous bacterial and fungal
diseases viz., bacterial soft rot, twister blight, stemphylium blight,
downy mildew and purple blotch. Among them twister blight disease causes severe
yield loss. A roving survey was executed in Chengalpattu and Kanchipuram
districts and assessed the prevalence of twister blight disease in onion.
According to the survey, Ullavur village in Kanchipuram district had the lowest
frequency of twister blight (38.34%), whereas Thirukzalkundram village in
Chengalpattu district had the highest incidence at 47.53 percent. Based on the
morphological features, four isolates of the pathogen have been identified as
belonging to Colletotrichum gloeosporioides. Among the four isolates
that conducted pathogenicity experiments, COCM-2 showed the highest level of
disease incident (76.65%), followed by COCT-1 (37.77%), while COKU-4 (17.77%)
was the lowest the incident.
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Pages:9-12
How to cite this article:
Sandhiya R, K Sowmya, M S Bhagavathi "Isolation and characterization of <i>Colletotrichum gloeosporioides </i>causing twister blight disease in onion". International Journal of Agriculture and Plant Science, Vol 7, Issue 2, 2025, Pages 9-12
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