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Integrated Management of Leaf Rot of Coconut
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...
| मुख्य लेखक: | |
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| अन्य लेखक: | |
| स्वरूप: | Ph.D Thesis |
| भाषा: | Undetermined |
| प्रकाशित: |
Vellayani
Department of Plant Pathology, College of Agriculture
2002
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| LEADER | 03069nam a2200181Ia 4500 | ||
|---|---|---|---|
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| 100 | |a Vrinda T S | ||
| 245 | |a Integrated Management of Leaf Rot of Coconut | ||
| 260 | |a Vellayani |b Department of Plant Pathology, College of Agriculture |c 2002 | ||
| 502 | |b MSc | ||
| 520 | 3 | |a 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. | |
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| 942 | |2 ddc |c TH | ||
| 999 | |c 26977 |d 26977 | ||
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