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 |
A purposive sampling survey was conducted in three districts viz., Thrissur, Malappuram and Wayanad during July-August, November-December March-April seasons for monitoring disease occurrence and sample collection. Three leaf blights (LB-1, LB-2 and LB-3), two leaf spots (LS-1 and LS-2) and powdery mildew (PM) were the foliage diseases observed during the survey. Petal blight was the only flower disease noticed apart from root rot and wilt disease. Eight pathogens were isolated from diseased samples and pathogenicity test for each disease was carried out which aided in relating symptoms of the disease under artificial conditions with that of natural symptoms. Cultural and morphological characterisation of each pathogen was carried out for the identification of pathogens and the identity was confirmed by National Center for Fungal Taxonomy (NCFT), New Delhi. The pathogens causing LB-1, LB-2 and LB-3 were identified as Alternaria alternata, Alternaria tenuissima and Myrothecium roridum respectively. The pathogens responsible for leaf spots (LS-1 and LS-2) were identified as Ulocladium chartarum and Curvularia pallescens and for powdery mildew as Golovinomyces cichoracearum and Podosphaera sp. Curvularia lunata was identified as the causal organism of petal blight. Moreover, root rot and wilt disease observed during the survey were caused due to Phytophthora cryptogea and Fusarium solani respectively.
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