Abstract
Rice gall dwarf was transmitted by R. dorsalis and by N. nigropictus in a persistent manner. The incubation period in the insects ranged from 5-11 days in R. dorsalis and 4-12 days in N. nigropictus, with an average of 7.6 and 7.9 days, respectively. R. dorsalis acquired the virus within 8 h of feeding on a diseased plant and transmitted the virus within a 1-h inoculation access period, the shortest time tested. Transmission efficiency was better in young nymphs than in older ones. There was no evidence of seed transmission of the virus.

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