ETIOLOGY, EPIDEMIOLOGY AND MANAGEMENT OF WILT OF POMEGRANATE CAUSED BY Ceratocystis fimbriata Ellis and Halst.
| dc.contributor.advisor | Mesta, R. K | |
| dc.contributor.author | R, SOMU | |
| dc.contributor.other | Mansur, Chidanand P. | |
| dc.contributor.other | Guled, M. B | |
| dc.contributor.other | Hipparagi, Kulapati | |
| dc.contributor.other | K. C, Kiran Kumar | |
| dc.contributor.other | S, Sriram | |
| dc.date.accessioned | 2018-12-01T04:59:32Z | |
| dc.date.available | 2018-12-01T04:59:32Z | |
| dc.date.issued | 2017-09 | |
| dc.description.abstract | A survey was carried out in major pomegranate growing districts of Karnataka to know the incidence of wilt during 2015-16, which revealed that the highest incidence of disease in Bagalkot district (15.27 %) and least in Chirtradurga district (3.75 %). Four years and above old orchards under black soil showed a higher incidence of wilt, shot hole borer and root knot nematode infection. Among the soil parameters electric conductivity of soil showed the significant positive correlation with per cent disease incidence. Among the ten media tested, all the five isolates showed the maximum growth and sporulation on oat meal agar, potato dextrose agar, malt extract agar. The temperature of 25°C, pH 5.0 and light alternates with 12 hr. of darkness were found best for the growth and sporulation of C. fimbriata. Starch and potassium nitrate were found to be the best carbon and nitrogen sources for the growth of the fungus, respectively. The soil inoculum level of 12 per cent concentration of C. fimbriata found to cause 98.33 per cent disease incidence. Survivability studies revealed that C. fimbriata can survive up to 34 weeks under refrigerated condition while it was 22 weeks in laboratory and 28 weeks in field condition. Soil temperature of 250C showed the maximum per cent colonization of the fungus on carrot baits. The cent per cent disease incidence was recorded at moisture level of 50, 60 and 70 per cent. The AUDPC and apparent rate of infection ‘r’ value was 142.50 and 0.13 at the end of September month respectively. Multiple regression analysis revealed that weather parameters influence to the extent of 44.00 per cent on per cent disease incidence. Step wise multiple regression analysis showed that among the weather parameters maximum variation was explained by rainfall (30.66 %). Twenty isolates of C. fimbriata were amplified at 500 bp length and isolates were sequenced and deposited in the GenBank under the accession numbers from KY987496 to KY987515. All isolates from different districts of Karnataka showed specific pattern of similarity according to geographical region. Among non-systemic fungicides cymoxanil + mancozeb, mancozeb and captan completely inhibited the mycelia growth of the fungus at all the concentrations tested. All the systemic fungicides tested showed 100 per cent inhibition except azoxystrobin. Among the bioagents Trichoderma harzianum-55 showed strong antagonistic activity against C. fimbriata. In the field experiment propiconazole (0.2%), propiconazole + difenoconazole (0.2%), tricyclazole (0.2%) and tebuconazole (0.2%), drenching four times at 15 days interval showed the maximum disease control with higher fruit yield and net returns. | en_US |
| dc.identifier.issn | UHS13PGD66 | |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810084946 | |
| dc.keywords | Ceratocystis fimbriata Ellis and Halst | en_US |
| dc.language.iso | en_US | en_US |
| dc.pages | 229 | en_US |
| dc.publisher | UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT | en_US |
| dc.research.problem | Theses | en_US |
| dc.sub | Horticulture | en_US |
| dc.subject | null | en_US |
| dc.theme | ETIOLOGY, EPIDEMIOLOGY AND MANAGEMENT OF WILT OF POMEGRANATE CAUSED BY Ceratocystis fimbriata Ellis and Halst. | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | ETIOLOGY, EPIDEMIOLOGY AND MANAGEMENT OF WILT OF POMEGRANATE CAUSED BY Ceratocystis fimbriata Ellis and Halst. | en_US |
| dc.type | Thesis | en_US |