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Identification of races, biovars and management of ralstonia solanacearum causing wilt of solanaceous crops with special reference to chilli (Capsicum annuum L.)

KrishiKosh

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Title Identification of races, biovars and management of ralstonia solanacearum causing wilt of solanaceous crops with special reference to chilli (Capsicum annuum L.)
 
Creator D, Sridhar
 
Contributor Nagaraju
 
Subject diseases, bacteria, biological phenomena, planting, vegetables, chillies, application methods, antibiotics, potatoes, ralstonia solanacearum
 
Description Production of solanaceous vegetables crops like tomato, chilli, brinjal and
potato has been seriously affected by bacterial wilt caused by Ralstonia
solanacearum. In the present investigation, 28 isolates of R.
solanacearum collected from different agro-climatic regions from chilli,
tomato, brinjal and potato of Karnataka and Kerala. All 28 isolates
infected the solanaceous crops (chilli, tomato, brinjal and potato) but
none of them infected ginger, mulberry and banana. All the isolates
induced a dark brown necrotic lesion on capsicum leaves 48 h after
inoculation. All the isolates oxidised and utilized the disaccharides and
sugar alcohols indicating that they belong to race-1 and biovar-III. Ujwala
and Anugraha varieties of chilli were highly resistant to the
bacterial wilt under greenhouse studies. Under field conditions,
Ujwala was highly resistant and Anugraha was resistant with 4.54 and
5.55 per cent disease incidence (PDI), respectively during Kharif 2011
and summer 2012. K-cycline was highly effective with maximum
inhibition zone (30.88 mm) followed by cephalaxin and paushamycin
under in vitro. Among botanicals, isabgol seed extract was highly effective
with 26.42mm mean inhibition zone followed by, garlic bulb extract
(20.15mm). Pseudomonas fluorescens was highly effective with inhibition
zone of 25.77mm followed by Bacillus subtilis (19.23 mm). Field trials
during kharif 2011 on chilli variety Byadgi kaddi revealed that, combined
application of K-cycline and P. fluorescens found best with least PDI of
14.27 at 95 days after transplanting (DAT). K-cycline + P. fluorescens
recorded maximum 100 fruit weight (390.15g), number of fruits/plant
(30.15) and green chilli yield (6.08 t/ha). During summer 2012, combined
application of K-cycline + P. fluorescens was highly effective with least PDI
of 16.67 at 95 DAT. Combined application of K-cycline + P. fluorescens
was highly superior for yield parameters with maximum fruit weight
(387.80g), number of fruits/plant (30) and green chilli yield (5.98 t/ha).
 
Date 2016-05-19T14:05:01Z
2016-05-19T14:05:01Z
2013-01-29
 
Type Thesis
 
Identifier Th-10456
http://krishikosh.egranth.ac.in/handle/1/66135
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru