Integrated Management of Leaf Rot of Coconut
By: Vrinda T S.
Contributor(s): Joseph P J (Guide).
Material type:
BookPublisher: Vellayani Department of Plant Pathology, College of Agriculture 2002DDC classification: 632.3 Online resources: Click here to access online Dissertation note: MSc Abstract: The study entitled as "Integrated management of leaf rot of coconut"
w as conducted at the Department of Plant Pathology, Co l.cge of Agr iculturc.
Ve l l a van i and Iie ld trial was conducted at RARS. Kumarakorn. Extensive
iso lai io n s. pathogenicity and characterization studies of the pathogens
assoc i aic d with leaf rot infected spindle leaf of coconut from di ffercnt
r e g ions 0 I' f ve southern districts of Kerala revealed that Collct otrichu m
g/oco.,porioidcs. Fusarium so/ani, Fusarium. monil if..rniae, Fusari utn
oxvsp or utn, Cephalosporium sacchari. Exserohilum rostrat um. Gl iocl adi um
roselllll.<';C\!o!idillll7 sp. and Curv ular i a sp. played <ignificant roie in t118
ct io lo gj 0" LRD. Based on frequency 01' isolarions. Fusarium spp. .ind
C .g/()(;o.,porioides Viere identified as major pathogens or LRD in these areas.
The present study constitutes the first report or the ct io log ica l ro l c of
Scvt ul uliurn ::;0 in leaf rot incidence.
Symptomatology of the disease based on natural incidence in the I'dd
and upon artificial inoculation were clearly described
The in vit ro
interactions of different dual combinations of LRD pathogens were found to
be predominantly associative rather than inhibitory in nature. The rapid
lesion development of certain dual combinations of the pathogens upon
artificial inoculation further signified the associative nature of these
pathogens.
Extensive in vi/m screening and leaf bit assay of different antagonistic
microorganism identified T9 culture of Trichoderma sp. PSI culture of
Pse u domonasfluorescens as two potential agents against i he major pathogens
of LRD. The in vitro interactions study of the selected fungal and bacterial
antagonist showed that both are incompatible and hence unsuitable for
combined delivery. Bioassay results showed that fungicides hcxaconazo lc and
propiconazole completely inhibited the growth of C. gloeosporioides.
E. rostra/um and F. solani while mancozeb was more effective at higher
concentrations. one of the fungicides was inhibitory to P. j7uorescens while
Trichoderma sp. was inhibited by hex aconazo!e and hence the fungal
antagonist was unsuitable for combined delivery with the fungicides.
Evaluation of different components of disease management indicated that
phytosanitation coupled with hexaconazole application was effective in
reducing disease severity of leaf rot in the field.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | 632.3 VRI/IN (Browse shelf) | Available | 172036 |
MSc
The study entitled as "Integrated management of leaf rot of coconut"
w as conducted at the Department of Plant Pathology, Co l.cge of Agr iculturc.
Ve l l a van i and Iie ld trial was conducted at RARS. Kumarakorn. Extensive
iso lai io n s. pathogenicity and characterization studies of the pathogens
assoc i aic d with leaf rot infected spindle leaf of coconut from di ffercnt
r e g ions 0 I' f ve southern districts of Kerala revealed that Collct otrichu m
g/oco.,porioidcs. Fusarium so/ani, Fusarium. monil if..rniae, Fusari utn
oxvsp or utn, Cephalosporium sacchari. Exserohilum rostrat um. Gl iocl adi um
roselllll.<';C\!o!idillll7 sp. and Curv ular i a sp. played
C .g/()(;o.,porioides Viere identified as major pathogens or LRD in these areas.
The present study constitutes the first report or the ct io log ica l ro l c of
Scvt ul uliurn ::;0 in leaf rot incidence.
Symptomatology of the disease based on natural incidence in the I'dd
and upon artificial inoculation were clearly described
The in vit ro
interactions of different dual combinations of LRD pathogens were found to
be predominantly associative rather than inhibitory in nature. The rapid
lesion development of certain dual combinations of the pathogens upon
artificial inoculation further signified the associative nature of these
pathogens.
Extensive in vi/m screening and leaf bit assay of different antagonistic
microorganism identified T9 culture of Trichoderma sp. PSI culture of
Pse u domonasfluorescens as two potential agents against i he major pathogens
of LRD. The in vitro interactions study of the selected fungal and bacterial
antagonist showed that both are incompatible and hence unsuitable for
combined delivery. Bioassay results showed that fungicides hcxaconazo lc and
propiconazole completely inhibited the growth of C. gloeosporioides.
E. rostra/um and F. solani while mancozeb was more effective at higher
concentrations. one of the fungicides was inhibitory to P. j7uorescens while
Trichoderma sp. was inhibited by hex aconazo!e and hence the fungal
antagonist was unsuitable for combined delivery with the fungicides.
Evaluation of different components of disease management indicated that
phytosanitation coupled with hexaconazole application was effective in
reducing disease severity of leaf rot in the field.
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