Abstract

Rice tungro bacilliform virus (RTBV) and rice tungro spherical virus (RTSV) were monitored in transplanted rice (Oryza sativa) by latex test or by enzyme-linked immunosorbent assay (ELISA). RTSV was detected 1 wk after transplanting, and the incidence increased rapidly within 2-3 wk. Dual infection by RTBV and RTSV was detected 2 wk after transplanting. The infectivity of leafhoppers collected in the field corresponded with the disease development. However, the development of the tungro disease differed in cultivars with vector resistance and in different planting seasons

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