Etiology and Management of Rhizome Rot Disease of Banana
By: Usha N K.
Contributor(s): Anita Cherian K (Guide).
Material type:
BookPublisher: Vellanikkara Department of Plant Pathology, College of Horticulture 2003DDC classification: 632.3 Online resources: Click here to access online Dissertation note: MSc Abstract: Rhizome rot disease of banana is one of the most serious diseases of banana
In Kerala.The pathogen was isolated from infected rhizomes of banana var.
Nendran and the pathogenicity was established after standardising the method of
inoculation .. The symptomatology of the disease was studied in detail under
natural field conditions and under artificially inoculated controlled conditions. The
salient symptoms of the disease were flaccidity and yellowing of leaves and soft
rotting of the rhizome. Based on the morphological, cultural, biochemical,
physiological and molecular characters, coupled with its pathogenicity, the
pathogen causing rhizome rot disease of banana var. Nendran was identified as
Erwinia carotovora.
Studies were conducted on the host range of the pathogen on five hosts viz.
heliconia, canna, ginger, turmeric and colocasia under field conditions. The results
revealed that the pathogen failed to infect these hosts. Studies on soil survival of
the pathogen revealed that the pathogen survived in the sterilized soil in the
presence of diseased rhizomes for 180-185 days.
Out of the 240 accessions of banana screened for resistance to rhizome rot
disease under natural field conditions, the genome AAB is found to be the most
susceptible one among the genornes screened. The variety Poppoulu (AAB) was
found to be the most severely infected one. The commercial variety of Kera1a viz;
endran was also found to be highly susceptible to the disease.
In vitro inhibitory effect of antibiotics, fungicides, botanicals, and
bioagents on the growth of the pathogen was tested. Among the fungicides, fytolan
at 0.4 per cent concentration gave the maximum inhibition followed by fytolan at
0.3 per cent. Among the antibiotics tried, streptocycline at 300 ppm was found to
be the most superior one. Garlic extract at 100 per cent concentration was the best
botanical for inhibiting the pathogen.
Pot culture experiment on the management of the disease revealed that
among the six treatments given, fytolan at 0.4 per cent and streptocycline at 300
ppm were found to be the most effective treatments in controlling the rhizome rot
disease of banana. Garlic extract at 100 percent concentration was also found to be
effective in managing the disease under field conditions, which was on par with
Pseudomonas flourescens (T2) and bleaching powder (Tl).
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MSc
Rhizome rot disease of banana is one of the most serious diseases of banana
In Kerala.The pathogen was isolated from infected rhizomes of banana var.
Nendran and the pathogenicity was established after standardising the method of
inoculation .. The symptomatology of the disease was studied in detail under
natural field conditions and under artificially inoculated controlled conditions. The
salient symptoms of the disease were flaccidity and yellowing of leaves and soft
rotting of the rhizome. Based on the morphological, cultural, biochemical,
physiological and molecular characters, coupled with its pathogenicity, the
pathogen causing rhizome rot disease of banana var. Nendran was identified as
Erwinia carotovora.
Studies were conducted on the host range of the pathogen on five hosts viz.
heliconia, canna, ginger, turmeric and colocasia under field conditions. The results
revealed that the pathogen failed to infect these hosts. Studies on soil survival of
the pathogen revealed that the pathogen survived in the sterilized soil in the
presence of diseased rhizomes for 180-185 days.
Out of the 240 accessions of banana screened for resistance to rhizome rot
disease under natural field conditions, the genome AAB is found to be the most
susceptible one among the genornes screened. The variety Poppoulu (AAB) was
found to be the most severely infected one. The commercial variety of Kera1a viz;
endran was also found to be highly susceptible to the disease.
In vitro inhibitory effect of antibiotics, fungicides, botanicals, and
bioagents on the growth of the pathogen was tested. Among the fungicides, fytolan
at 0.4 per cent concentration gave the maximum inhibition followed by fytolan at
0.3 per cent. Among the antibiotics tried, streptocycline at 300 ppm was found to
be the most superior one. Garlic extract at 100 per cent concentration was the best
botanical for inhibiting the pathogen.
Pot culture experiment on the management of the disease revealed that
among the six treatments given, fytolan at 0.4 per cent and streptocycline at 300
ppm were found to be the most effective treatments in controlling the rhizome rot
disease of banana. Garlic extract at 100 percent concentration was also found to be
effective in managing the disease under field conditions, which was on par with
Pseudomonas flourescens (T2) and bleaching powder (Tl).
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