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'1'wo rice virus diseases, grassy stunt ancl ragged stunt, transmitted by the brown planthopper, MldEParvata tagens STXL, are prevailing widely in Southeast Asia. Recently, the third virus disease, wilted stunt, vectored by thc brown planthopper has been reported in Taiwan (CHEN ct al., 1978), In Japan, grassy stunt was discovered in 1978 (IwAsAKI and SHiNKAi, 1979) and ragged stunt in 1979 (SmNKAi et al., 1980). The occurrencc ot' both virus d{seases has so far been restricted to Kyushu, one of the main southwestern islands in

applied entomology and zoology

Proportion of Viruliferous Immigrants of the Brown Planthopper, Nilaparvata lugens STAL (Hemiptera : Delphacidae)Transmitting Rice Grassy Stunt Virus during 1979-1983