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Crop Protection Division, National Academy of Agricultural Service, Suwon 441-707, Korea(Received on July 21, 2012; Revised on August 17, 2012; Accepted on August 22, 2012)The small brown planthopper (Laodelphax striatellus) is one of the most important rice pests in Republic ofKorea because it damages rice plants not only by sap-sucking but also by transmitting Rice stripe virus (RSV).Outbreaks of RSV are closely related to outbreaks of the small brown planthopper (SBPH). Therefore, it isvery important to control SBPH for the management of RSV. Mass-migrating SBPH collected by aerial nettraps in June 2011 at Taeanup, Geunheungmyon and Gonammyon in Taeangun were examined for viruscarrier status and effects of the pesticide, ‘Myungtaja’, on the control of RSV. Among 1,217 SBPH trapped,about 7.7% were detected as RSV positive and 4.4% were positive for Rice black streak dwarf virus (RBSDV)by RT-PCR. After the mass migration, pesticide ‘Myungtaja’ was sprayed once or twice on rice fields andcompared to untreated fields. The incidence of RSV was not affected by the frequency of spraying‘Myungtaja’ but was influenced by the time of pesticide treatment. Myungtaja’ treatment within 5−7 daysafter mass migration resulted in the most efficient RSV control, resulting in RSV incidence decreased by87.6% compared to the control. Therefore, we conclude that pesticide spraying for RSV control was mosteffective when it was done within 5−7 days after mass migration.Keywords : Mass migration, Myungtaja, Rice stripe virus, Small brown planthopper     (Rice stripe virus, RSV), (Riceblack streaked-dwarf virus, RBSDV)  (Ricedwarf virus, RDV) 3  (Kim , 2008).RSV Tenuivirus   , RBSDV RDV Reoviridae   (Toriyama, 2000). RSV RBSDV (Small BrownPlanthopper, SBPH)    . RSV     ,

Evaluation of Pesticide Treatment for Control of Rice stripe virus after Mass Migration of Small Brown Planthoppers