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 |
Rice tungro virus (RTV) is a complex disease caused by RTBV (rice tungro bacilliform virus) and RTSV (rice tungro spherical virus). In West Bengal, it is transmitted by different species of green leafhopper (GLH) like Nephotettix virescens, Nephotettix nigropictus and Zigzag leafhopper (ZLH) R. dorsalis. The present investigation was made to observe the incidence of RTV and the population dynamic of its predominant vector green leafhoppers (GLH). Survey on incidence of the disease under field condition revealed that tungro virus was present in almost all the varieties under study, however Taichung native 1 (TN1) was found to be highly susceptible variety to the virus followed by IET 4786, IR 64, IET 1444, IR 36 and IR 62. Regarding the population dynamic of GLH, it was found that GLH was present in the rice as well as some weed host and the population was found to increase from the month of June to October and after that it started decreasing. It was also observed that highest population of GLH was at maximum tillering stage irrespective of varieties followed by flowering stage, panicle initiation stage and seedbed. The study revealed that the high rate of incidence of RTV at the late stage of crop was related with the high population of tungro vector in the field as well as availability of sufficient amount of virus source.
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