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It has been an important problem on resistant breeding that cultivar’s resistance of rice to blast disease caused by Magnaporthe grisea (Hebert)Barr. is easily broken down. In order to find out resources with durable resistance to blast, the study was carried out during 1990—1994. One hundred and forty test entries, screened from 38,000 domestic and exotic rice materials were grown in a group of the blast nurseries for years (Table 1). The test was mainly bred on natural inducement, although chopped pieces of diseased straw were scattered and spore suspension of a mixture of isolates were sprayed to facilitate the infection. The results demonstrated that disease infected scales of Tetep, Oryza minuta J.S. Preslex C.B. presl, Xiangzi 3150, Tianjinyeshendao, Mowanggu, and Gumei 2, etc., were 0—5 scales for leaf blast (LB), 0—3 scales for panicle blast (PB). LB of Nanjing 11 (check) with slow-blast reported by some re
It has been an important problem on resistant breeding that cultivar’s resistance of rice to blast disease caused by Magnaporthe grisea (Hebert) Barr. Is easily broken down. In order to find out resources with durable resistance to blast, the study was carried out during 1990 -1994. One hundred and forty test entries, screened from 38,000 domestic and exotic rice materials were grown in a group of the blast nurseries for years (Table 1). The test was mainly bred on natural inducement, although chopped pieces of diseased straw were scattered and spore suspension of a mixture of isolates were sprayed to facilitate the infection. The results demonstrated that disease infected scales of Tetep, Oryza minuta JS Preslex CB presl, Xiangzi 3150, Tianjinyeshendao, Mowanggu, and Gumei 2, etc., were 0- 5 scales for leaf blast (LB), 0-3 scales for panicle blast (PB). LB of Nanjing 11 (check) with slow-blast reported by some re