FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: RYMV, paddy yield, inoculation regimes, Sobemovirus
Screenhouse trials were conducted from 2008 to 2010 cropping seasons to assess growth and yield parameters of ten (10) selected rice cultivars, which include; Faro 11, Faro 35, Faro 36, Faro 37, Faro 44, Faro 46, Faro 52, Faro57, Moroberekan and Bouake 189, infected with Rice Yellow Mottle Virus (RYMV) genus Sobemovirus. The experiment was laid out in a strip plot design and replicated three times, with ten rice cultivars in the vertical factors (main plot) and four inoculation regimes of RYMV at 4, 6, 8 and 10 Weeks after sowing (WAS) and un-inoculated control was in the horizontal factors (sub-plot). Significant interaction between the effects of inoculation regimes and rice cultivars were found between the growth and yield parameters and severity index of the virus. Combined analysis of the trials data showed that percentage reduction in plant height and number of tiller per plant, increase in days to 50% flowering, threshing percentage, paddy yield loss and Severity index ranged from 1.74% (Moroberekan) to 48.19% (Bouake 189) and 27.71% (Moroberekan) to 53.06% (Bouake 189), 1.78 (Faro 46) to 25.78 (Faro 57), 69.83% (Bouake 189) to 91% (Moroberekan), 6.59% (Moroberekan) to 79.11% (Bouake 189) and 17.04% (Moroberekan) to 77.61% (Bouake 189), respectively. The test cultivars were most critically affected by RYMV inoculation within 4 to 8 WAS. In order to obtain paddy yield comparable to that of virus free check for the respective test cultivars, it was required to keep the crop virus- free for up to 10 WAS and beyond, the information can be useful in integrated pest and production management for rice in RYMV endemic areas.
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