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 |
Leaf spot disease (Alternaria alternata) causes severe foliar damage to niger crop. The isolates of A.alternata were collected from different location and tested for their variability in term of morphological, cultural and pathological variation viz., growth rate, colony colour, aerial mycelium colour, growth pattern, sporulation, conidial size, conidial sepation. In case of growth rate Aa1 and Aa2 was observed very fast growing it cover 70-73 mm growth within 7 days of inoculation on PDA media. Among the five isolates different colony colour and aerial mycelium colour was observed. The variation in mycelial growth pattern was observed in Aa2 isolate growing with circular pattern and other four show irregular growth pattern. In respect of sporulation abundant sporulation was observed in Aa2 show more than 30 spore in single microscopic field. In case of conidial size maximum conidial length (41.10) was noticed in Aa5 and breadth (11.66) in Aa1. The Maximum number of transverse septa were observed in Aa5 (4-8) and longitudinal septa in Aa1 and Aa2 (0-3). In case of pathogenicity Aa2 isolates was most virulent than other isolates of Alteranria alternata.
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