[Evaluation of resistance of certain rice cultivars at early growth stages to tungro virus disease]
1989
Mohamed, I.A.
Tungro is the most important virus disease of rice in tropical Asia. The impacts of the disease depend on the rice cultivar, environmental conditions, the age of the plant, and the strain of the virus. The principle vector of tungro is the green leafhopper (Nephotettix virescens (Distant)). Six rice cultivars IR22, TN1, IR66, ASD8, Pankhari 203 and IR62, were tested in the virology glasshouse at IRRI. N. virescens reared on infected rice plants were used for inoculation disease symptoms severity, height reduction and reaction to the iodine test were recorded. The severity of the disease varied greatly depending on varieties tested. TN1 was highly susceptible to tungro, whereas IR66 and ASD8 were resistant and showed no height reduction and could be used in breeding programmes to incorporate resistance
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