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 |
Investigation was carried out on roving survey for recording the severity of purple blotch disease of onion during Rabi 2015-16 and 2016-17 in nine districts of Rajasthan viz., Bikaner, Alwar, Jaipur, Jhunjhunu, Jodhpur, Sikar, Chittorgarh, Sriganganagar and Baran, and two district of Haryana viz., Hisar and Bhiwani and one district of Punjab viz., Abohar. The intensity of disease was noted by counting at least 100 plants in each field. Observation on purple blotch intensity was recorded; the symptoms expressed as initial small, water-soaked lesions later turned to light yellow to brown coloured. The per cent disease severity was calculated by using 0-5 point disease rating scale. On the basis of survey and surveillance of purple blotch of onion incited by Alternaria porri and found that Alwar district has maximum disease severity 11.21 and 11.99% in Rabi 2015-16 and 2016-17, respectively and minimum disease severity was observed in Chittorgarh 8.04 and 9.11% in Rabi 2015-16 and 2016-17, respectively. The observation of this survey is very useful to identify the hot spot of this disease.
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