1998年辽宁省稻瘟病菌种群动态分析

1998年秋在辽宁省14个县区的水稻产田和试验田中96个品种（系）上采集的115份稻瘟病标样中，采用单孢分离法分离出74个单孢菌株。经在7个中国鉴别品种上进行鉴定，74个单孢菌株划分为7群18个生理小种；其中在辽宁省流行的优势种群为ZD群和ZF群；同1997年相比，ZD群小种稳中有降，ZF群小种又有上升，重新成为优势种群；1985年导致中丹2号水稻抗瘟性丧失的ZA_（61）小种再度出现；ZG群小种虽然出现频率不高，但又显上升势头。

Race Dynamics Analysis of Rice Blast in Liaoning Province in 1998

115 samples were collected and 74 menospore strains of rice blast pathogen (Pyricularia grisea Saccardo)were isolated from Liaoning Province in 1998. The 74 monospore strains were divided into 7 groups and 18physiological races. The tests showed that ZD and ZF were dominant groups in Liaoning Province. Compared with results obtained last year. ZD group was decreased slightly, and ZF group was increased and became a dominant race. ZA_6 which was a dominant race in 1985 reoccurred in 1998. The occurrence frequency of ZG group was not a high level but showed a tendency to rise.