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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2018: 95.39
For more details click here

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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

Int.J.Curr.Microbiol.App.Sci.2020.9(4): 1527-1543
DOI: https://doi.org/10.20546/ijcmas.2020.904.180


Virulence Analysis and Influence of Soil Type and Agronomic Practices with Respect to Incidence of Ganoderma Wilt of Coconut in Southern Karnataka, India
B. Palanna1*, K. R. Shreenivasa2, B. Boraiah3, S. Basavaraj2 and T. Narendrappa2
1ICAR- AICRP on Small Millets, Project Coordinating Unit, University of Agricultural Sciences, GKVK, Bengaluru-560065, Karnataka, India
 2Department of Plant Pathology, UAS, GKVK, Bengaluru-560065, Karnataka, India
3ZARS, University of Agricultural Sciences, GKVK, Bengaluru-560065, India
*Corresponding author
Abstract:

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.


Keywords: Coconut, Ganoderma wilt, Virulence, Disease Severity Index,Soil type
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How to cite this article:

Palanna, K. B., K. R. Shreenivasa, B. Boraiah, S. Basavaraj and Narendrappa, T. 2020. Virulence Analysis and Influence of Soil Type and Agronomic Practices with Respect to Incidence of Ganoderma Wilt of Coconut in Southern Karnataka, India.Int.J.Curr.Microbiol.App.Sci. 9(4): 1527-1543. doi: https://doi.org/10.20546/ijcmas.2020.904.180