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In order to clear the composition and distribution of physiological races of Pyricularia oryae in Heilongjiang Province,299 single spore isolates of P.oryae collected from five rice regions( 30 cities,counties or farms) in Heilongjiang Province form 2007 to 2011 were identified by seven differential varieties in China,and a total of seven groups with 31 physiological races had been identified. The results showed that ZA,ZD and ZB groups were the dominant groups in Heilongjiang Province,with the occurrence frequencies of 34. 8%,31. 1% and 16. 1%,respectively. ZD5was the dominant race with the occurrence frequency of17. 1%; followed by ZA49and ZD1,with the occurrence frequencies of 13.7% and 10.7%,respectively. The types and compositions of physiological races of P.oryae varied with rice regions.
In order to clear the composition and distribution of physiological races of Pyricularia oryae in Heilongjiang Province, 299 single spore isolates of P.oryae collected from five rice regions (30 cities, counties or farms) in Heilongjiang Province form 2007 to 2011 were identified by seven Differential strains in China, and a total of seven groups with 31 physiological races had been identified. The results showed that ZA, ZD and ZB groups were the dominant groups in Heilongjiang Province, with the occurrence frequencies of 34. 8%, 31. 1 % and 16. 1%, respectively. ZD5was the dominant race with the occurrence frequency of17. 1%; followed by ZA49and ZD1, with the occurrence frequencies of 13.7% and 10.7%, respectively. The types and compositions of physiological races of P. oryae varied with rice regions.