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 |
Ganoderma wilt of coconut, caused by Ganoderma spp. is one of the most important constraints limiting coconut production and productivity in Southern Karnataka. The incidence of Ganoderma wilt of coconut during the year 2015-16 ranged from 0 to 47 per cent in southern dry tracts of Karnataka among 356 gardens surveyed. Tumkur recorded maximum incidence (16.75 %) followed by Chitradurga (14.86 %) and Hassan (11.12 %) among four districts surveyed. Ganoderma wilt was noticed in mono crop as well as mixed crop of coconut and incidence of disease was more with coconut and arecanut intercropping compared to sole crop. However, the percentage of incidence with particular cropping system varied greatly from garden to garden. Among the different soil types, maximum incidence (14.28 %) was observed in sandy soils followed by red soils (13.52 %). Canal water irrigated gardens accounted maximum (19.20 %) incidence. Similarly, gardens under flood irrigation recorded maximum (17.78 %) incidence. The gardens under regular cultivation recoded maximum incidence compared to un cultivated gardens. The disease incidence with respect to age of the palms revealed that maximum (14.92 %) incidence was noticed in age group of 30-50 years followed by 15-30 years of age. Virulence of 9 Ganoderma isolates of coconut tested under pot culture revealed that isolate CG11 recorded maximum (62.50) DSI at 9 months after inoculation followed by CG7 and CG8 which accounted 56.25 DSI and were on par with each other, which were found to be virulent compared to other isolates.
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