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Assuming random immigration to the rice field by infective adults of the green rice leafhopper, At (percentage of infectcd 'hills) is expressed by the fbllowing equation (KiRiTANi and NAKAsuJi, 1977). At:T-1--exp(-aJNA・L・P) (1) where a is the number of hills infected successfully by an infective adult per day, NA is the total munber of adults per hi]I that have immigrated to the rice field, L is the mean Iongevity of adults in days under .natural conditions and P is the percentage of RDV-infective individuals. Two parameters (a,P) and A,(.,.) (observed proportion of infected hills) were assesscd by the fo11ewing methocls. i Prcsent address: Divisien ofEpidemiology, Saitama Canccr Center 1<esearch Institute. Ina-machi, Kita-adachigun, Saitama 362, Japan.

An Experimental Validation of the Systems Model for the Prediction of Rice Dwarf Virus Infection