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VARIABILITY AND MANAGEMENT OF COLLETOTRICHUM CAPSICI THE CAUSAL ORGANISM OF CHILLI ANTHRACNOSE

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Title VARIABILITY AND MANAGEMENT OF COLLETOTRICHUM CAPSICI THE CAUSAL ORGANISM OF CHILLI ANTHRACNOSE
 
Creator Kumar, Arvind
 
Contributor Singh, S.K.
 
Subject CHILLI ANTHRACNOSE, COLLETOTRICHUM CAPSICI, VARIABILITY, RESISTANCE, BIOAGENT, FUNGICIDE AND DISEASE MANAGEMENT
 
Description M.Sc. Dissertation
The investigation regarding variability and management of Colletotrichum capsici
the causal organism of chilli anthracnose was carried out during the year 2015. The disease
was reported in all the chilli growing areas of Jammu subtropics with the maximum
dieback intensity observed in Udhampur (24.80 %), followed by Jammu (23.20 %)
whereas, maximum fruit rot intensity (39.46 %) was observed in Udhampur followed by
Kathua (39.20 %) at fruit maturity stage.
The pathogenicity of C. capsici isolates (Cc1 to Cc10) was conducted on detached
chilli fruits (cv. Pusa Jawala), where the maximum fruit rot intensity (44.22%) was in case
of isolate Cc10 and least in Cc1 (22.44%). Cultural and morphological variability of C.
capsici isolates exhibited that the colonies were cottony or fluffy, rarely suppressed with
colour ranging from white to brown, colony margins varied from regular to irregular. The
spore size ranged from 21.42 to 32.20μm in length and 2.11 to 5.35μm in breadth. The
shape of spores was observed as falcate to fusiform. Setae size also varied in length and
breadth ranging from 63.20 to 121.22μm and 4.48 to 5.35 μm, respectively. Acervulli
production varied from 31-55/5mm fungal disc among the ten C. capsici isolates. All the
isolates (Cc1 to Cc10) showed excellent growth on PDA while on ZDA and PCA medium
showed fair growth.
Propiconazole was the most effective at 200 ppm, inhibiting the pathogen (Cc10
isolate) by 94.32 per cent, followed by difenconazole (94.24 %). Whereas, Trichoderma
harzianum-2 proved best among the bioagents tested, inhibiting 78.45 per cent of mycelial
growth of the pathogen under dual culture method. Thirty chilli genotypes were screened
against the disease under artificially inoculated field conditions and genotypes viz.
Chandermukhi, California Wonder, Arka Lohit, Jayant, Ujwala, Pant C-1, Hot Pepper and
Arka Megna were observed as moderately resistant. Using detached fruit method, under
laboratory conditions only Chandermukhi, Arka Lohit and Ujwala sustained the inoculum
pressure of pathogen and again behaved as moderately resistant.
In nursery management, the most effective treatment was application of FYM in
combination with carbendazim as seed treatment which resulted only 17.54 per cent
dieback intensity. Whereas, carbendazim used as seed treatment resulted in 19.10 per cent
die back intensity. In field studies, propiconazole @ 0.1% significantly reduced the fruit
rot (72.12%) and increased fruit yield (59.47%) of chilli followed by azoxystrobin, which
also reduced fruit rot (66.38%) and increased fruit yield (57.29%) of chilli.
 
Date 2016-09-23T12:32:01Z
2016-09-23T12:32:01Z
2016
 
Type Thesis
 
Identifier J-13-M-347
http://krishikosh.egranth.ac.in/handle/1/78558
 
Language en
 
Format application/pdf
 
Publisher DIVISION OF PLANT PATHOLOGY, Sher-e-Kashmir University of Agricultural Sciences & Technology of Jammu