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STUDIES ON BACTERIAL BLIGHT OF POMEGRANATE CAUSED BY Xanthomonas axonopodis pv. punicae (Hingorani and Singh) Vauterin et al.

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Title STUDIES ON BACTERIAL BLIGHT OF POMEGRANATE CAUSED BY Xanthomonas axonopodis pv. punicae (Hingorani and Singh) Vauterin et al.
 
Creator KATWAL, VINAY SINGH
 
Contributor SHARMA, R.C.
 
Subject ---
bacterial blight,pomegranate,Xanthomonas axonopodis pv. punicae
 
Description ABSTRACT
The present investigation entitled “Studies on bacterial blight of pomegranate caused by Xanthomonas
axonopodis pv. punicae (Hingorani and Singh) Vauterin et al” was conducted in the laboratories of Department
of Plant Pathology and experimental farm of Department of Fruit Science during the year 2012 to 2014.
Considering the magnitude and losses due to bacterial blight in pomegranate, investigations were undertaken on
cause of the disease, variability, epidemiological factors and management aspects. Survey revealed that disease
was prevelant in nine districts of Himachal Pradesh with highest incidence and severity in Jachh in Kangra
district. The bacterium was rod shaped, gram negative and non-spore forming. It was positive to starch
hydrolysis, gelatin, liquefaction and H2S production. Yeast extract dextrose broth was found superior in
supporting the growth of the pathogen at a temperature of 28±1oC with a pH range of 6.5. Study on 20 different
bacterial isolates revealed variations in growth and colour in cultural studies, size in morphological and
appearance of symptoms in pathogenic studies. The isolates exhibited 100 per cent polymorphism for OPA-2,
OPB-1, OPF-7 and OPF-10 primers showing significant molecular variability. The infection rate increases as
rainfall, temperature and relative humidity favours the disease development and spread, in 2012 and 2013 on
both leaves and fruits. The AUDPC was maximum on leaves as compared to fruits in both the years. None of
the tested weeds were found as collateral host of the pathogen. All the pomegranate germplasm was moderately
to highly susceptible against the disease. Salicylic acid (100 ppm) was effective under pot and field conditions
to reduce the disease severity. Pseudomonas fluorescens and cow urine (5%) were significantly effective in
reducing the disease severity under in vitro, pot and field conditions. Clove oil, eucalyptus oil and neem oil
reduced the disease severity under in vitro, pot and field conditions, respectively. Among chemicals
streptocycline (100 ppm) and Bordeaux mixture 1% spray was very effective in reducing the disease severity
under in vitro and field conditions. COC (0.25%) + streptocycline (0.01%) as paste treatment was highly
effective in managing the disease. Application of Bordeaux mixture (1%) + bleaching powder (100g/plant)
reduces the initial inoculum in the field. Pruning in the month of December and January reduces the disease
severity to some extent. Application of NPK and multinutrients lowers severity of the disease under field
conditions. The IDM strategy evaluated was found successful and feasible in managing the disease than
individual treatments for disease control.
 
Date 2016-06-02T15:22:03Z
2016-06-02T15:22:03Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66650
 
Language en
 
Format application/pdf