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 |
The roving survey was undertaken in five districts of northern parts of Karnataka viz., Belagavi, Dharwad, Gadag, Haveri and Uttara Kannada. Maximum disease severity was observed in Uttara Kannada district with 10.16 Percent Disease Index (PDI) at boll initiation stage and 30.94 PDI at boll maturity stage which was followed by Dharwad district. However, minimum disease incidence i.e., 7.71 PDI at boll initiation stage and 24.70 PDI at boll maturity stage was recorded in Gadag district. Observations regarding geographical coordinates indicated that the disease complex showed an increasing trend with the increase in latitude from 14o N to 17o N and showed a declining trend with the increase in distance from 74o E to 76o E with maximum disease severity at the elevation of 500 m to 600 m at both the growth stages of boll. Maximum disease incidence was noticed on bolls at lower part of the plant compared to those of mid and upper parts. Regions under Hilly zone (Zone 9) recorded maximum average disease incidence i.e., 10.75 PDI at boll initiation stage and 30.77 PDI at boll maturity stage.
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