Generally oats infected with barley yellow dwarf virus show reddish colouration of leaves whereas leaves of rice infected with the same virus become yellow in colour. what is the reason and mechanism behind this
You may find few additional info at: http://www.cabi.org/isc/datasheet/10539
cit: "Symptoms caused by BYDVs differ with the host species and cultivar, the age and the physiological state of the host plant at the time of infection, the strain and the environmental conditions and can be easily confused with nutritional and abiotic disorders..."