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 (Allium cepa L.) is an important bulbous vegetable crop grown all over the world and known for its pungency and flavor. Onion production is affected by various diseases. Among the diseases, purple blotch caused by Alternaria porri (Ellis) Cif is one of the major destructive diseases and cause damage to both foliage production and also bulb yield. A survey was carried out in major onion growing areas of Tamil nadu viz., Dindugal, Permabalur, Theni, Madurai, Salem, Dharmapuri and Krishnagiri districts. The highest purple blotch severity of 60.8 percent disease index (PDI) was observed at Andipatti village in Theni district, less severity of 29.5 percent PDI was noticed in Periyamuthoor area of Krishnagiri district. Isolation was made from infected onion leaves which showed prominent purple blotch symptoms. Pure culture of fungal pathogen (A. porri) was obtained and its pathogenicity was proved on onion plants. The isolated pathogen was confirmed as Alternaria porri (Ellis) Cif. based on the fungal culture morphology and its pathogenicity on onion plants.
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