Identification and Analysis on Physiological Races of PhytophthorainfestansIsolated in 2014 from Tomatoes in Fujian

The physiological races of Phytophthora infestans isolated in 2014 from tomatoes in Fujian were studied.Seven physiological races from the 78 isolates were identified in 5hosts.Among them,T1,2 was the most widely distributed and predominant in the province with an appearance frequency of 28.20%.The occurrence frequency of the virulent genes resistant to Ph-1,Ph-2,Ph-3,Ph-4and Ph-5 were 100%,64.1%,35.09%,35.09% and26.92%,respectively.It appeared that the tomato cultivars carrying Ph-1and Ph-2genes had become susceptible to the prevalent races of P.infestans in Fujian.