Epidemic Outbreak of Blast Disease in the Resistant Variety of Rice, 'Kwanok'

저항성품종인 '관옥'의 도열병 격발원인

1. In order to investigate the epidemic outbreak of rice blast disease on the resistant variety Kwankon in 1969, this investigation was undertaken as a basis for breeding resistant varieties. 2. The 16 isolates collected from Kyunggi area were inoculated at the 3-4 leaf stage on 12 Japanese differential varieties used for identifying races under greenhouse conditions. Out of 16 isolates 15 were identified as C race group and one as N race group. Of the 15 rates, nine were C-8, two were C-7 and two were C-1. Of the remaining two isolates, one was similar to C-1, and the other was similar to C-5. 3. It is concluded that the epidemic in the resistant variety 'Kwanok' was due to the occurrence of the C race group, which can infect the Chinese type varieties.

1) 수도 도열병에 저항성이었던 관옥 품종이 1969년에 와서 저항성이 역전된 원인을 분석하였다. 2) 경기도지방 16개 지역의 이병된 관옥품종에서 분리한 균주는 15개의 C계통 레이스와 1개의 N계통 레이스로 판정되었다. C계통 레이스 중에는 C-8이 9균주, C-7과 C-1이 각각 2균주, 그 나머지는 C-1과 유사한 것이 1균주이고 C-5와 유사한 것이 1균주였다. 3) 도열병에 대하여 고도로 저항성이었던 관옥품종은 중국계통의 벼를 침해 한 수 있는 C레이스의 만연에 기인되었다고 결론지을 수 있다.