National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Onion being important vegetable crop grown in India is preferred mainly because of its green leaves, immature and mature bulbs which are either eaten raw or cooked as a vegetable. Post-harvest losses due to desiccation, decay and sprouting possess a great threat for effective economic use of onion. Infected large and small sized onions (495 numbers) were collected from different market places of Bhubaneswar, Odisha for association of fungal mycoflora. Out of these Aspergillus niger, Fusarium oxysporum and Botrytis sp were found to be associated with 214,169 and 112 number of rotted samples of both large and small sized onion samples respectively. Whitish black rotten areas with blackish powdery masses and water soaked patches on the skin were found on different size of onion. Whitish fungal growth of F.oxysporum was found in Potato dextrose agar (PDA) which turned pink colour after seven days of inoculation and its conidia measured to 18.39-25.63 × 3.58-4.93µm. Green white mycelium was developed on the petridish by Botrytis sp. and measured 7.77 ×4.58 µm. Mycelium of A.niger was submerged, hyaline, septate and complete black colouration on Potato Dextrose Agar (PDA). Vesicle measured 55-85 µm. Potato Dextrose Agar (PDA) medium supported highest growth of F.oxysporum (80.13mm) followed by Richard’s agar (76.63mm). Potato Rose Bengal Agar supported least growth 38.23mm. PDA also supported highest radial growth of A.niger (81mm). The growth of F.oxysporum increased from 15°C reaching maximum at 25°C (82.25mm) and declined thereafter with minimum in 35°C (64.75mm).
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