DEMIOLOGY AND MANAGEMENT OF PURPLE BLOTCH IN ONION
| dc.contributor.advisor | KANSAL, SANDEEP | |
| dc.contributor.author | DANGI, RISHIKA | |
| dc.date.accessioned | 2019-11-18T08:52:07Z | |
| dc.date.available | 2019-11-18T08:52:07Z | |
| dc.date.issued | 2018-07 | |
| dc.description.abstract | ABSTRACT Purple blotch caused by Alternaria porri (Ellis) Cifferi is one of the major disease in onion growing areas of Himachal Pradesh. Survey studies conducted in the present investigation revealed that disease occurred in moderate to severe form in different onion growing localities of Solan and Sirmour districts of Himachal Pradesh. The test pathogen was isolated in pure culture on PDA. The microscopic examination of test fungus revealed peculiar obclavate or obpyriform conidia with long beak. Thus, based on cultural and morphological characters the test pathogen was identified as Alternaria porri (Ellis) Cifferi. Pathogenicity tests revealed initial symptoms as small sunken whitish fleck which later on became oblong with peculiar purple zonations giving target board like appearance to the lesion. Epidemiological studies revealed that temperature of 25oC, RH of 100.0 per cent and leaf wetness period of 24 h were optimum for the disease development reflecting significantly high rate of infection. The results of survival studies indicated a significant decrease in survivability of pathogen with the increase in storage duration and depth of burial. In vitro evaluation studies reflected Cabrio Top (metiram + pyraclostrobin), Folicur (tebuconazole), and Amistar (azoxystrobin) as most efficacious fungicides in inhibiting the mycelial growth of Alternaria porri while amongst botanicals garlic and NSKE provided significantly high inhibitory response. Field evaluation studies inferred the application of four foliar sprays of Cabrio Top (metiram + pyraclostrobin) @ 0.2 per cent at ten days interval started with the initiation of disease to be most efficacious in limiting the purple blotch of onion (83.41%) and enhancing the bulb yield (255.32 q/ha) with ICBR ratio of 1:8.78. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810135626 | |
| dc.keywords | Alternaria porri Cifferi ,onion,disease, growing areas | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 43+iii | en_US |
| dc.publisher | UHF,NAUNI | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | Alternaria porri Cifferi ,onion,disease, growing areas | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | DEMIOLOGY AND MANAGEMENT OF PURPLE BLOTCH IN ONION | en_US |
| dc.type | Thesis | en_US |