Biology and Management of Colletotrichum sublineolum Casuing Anthracnose of Sorghum
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Date
2024
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MPUAT, Udaipur
Abstract
The present study was undertaken on “Biology and Management of
Colletotrichum sublineolum Causing Anthracnose of Sorghum”. The investigation
was purposed; survey, distribution, isolation, purification, identification,
pathogenicity test, cultural, morphological and pathogenic variability, screening of
promising varieties and hybrids of sorghum and to test the bio-efficacy of new
generation fungicides, bio agent and neem oil under in vitro and field conditions.
The disease samples of sorghum leaves were collected from different sorghum
growing districts of Rajasthan revealed that the highest anthracnose severity (47.52%)
was recorded at Agronomy farm, RCA, Udaipur and the least severity (17.60%) was
recorded in Kherli village of Alwer district. Isolation of the pathogen and pure
cultures were isolated from the diseased samples collected from different surveyed
districts. Further conformation is done by proving pathogenicity on pot grown
sorghum cultivar “Kekri local” in cage house using Koch’s postulates, identification
of the fungus was confirmed as Colletotrichum sublineolum. The pathogen identified
was confirmed from ITCC, IARI, New Delhi by deposition of culture with I.D.No.-
11.881.23 as Colletotrichum sublineolum.
The fungus exhibited variability with respect to cultural and morphological
characters comprises growth, colony colour, number of conidia, pigmentation, size
and shape of conidia. Among the cultural variations of isolates, maximum mycelial
growth (84.05 mm) was recorded in RJCS-UDZ isolate as greyish white colour
colony, fluffy cottony growth with light grey colour of pigmentation. The isolate
RJCS-UDZ produced maximum number (65.82 /ml x 107) of conidia. Morphological
variability was exhibited, shape of conidia varied from hyaline, smooth, falcate to
curved with tapering ends. The maximum length (26.59 μm) and width (4.56 μm) of
conidia was recorded in isolate RJCS-ALW. The maximum length (217.02 μm) and
width (85.46 μm) of acervuli was recorded in isolate RJCS-ALW. Isolate RJCS-ALW
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Citation
Singh S. and Rawal P.