Resistance of the rice variety Utri Rajapan to ragged stunt and tungro viruses

Utri Rajapan, a rice variety tolerant to the brown planthopper, Nilaparvata lugens, was resistant to rice ragged stunt virus transmitted by N. lugens and to rice tungro virus transmitted by the green leafhopper, Nephottetix virescens. Although some Utri Rajapan plants became infected with tungro virus, symptoms were mild and disappeared as the plant matured. Of the two tungro-associated viruses, only rice tungro bacilliform virus was present in Utri Rajapan. The infected plants thus did not serve as a source of inoculum for transmission to healthy plants, as rice tungro spherical virus must also be present for transmission to occur.