关键词: 番茄晚疫病, 生理小种, 鉴别寄主, 鉴定

Abstract: Two hundred and one isolates of Phytophthora infestans on tomato from eighteen provinces , cities and autonomous regions were identified by using five differential tomato lines containing different resistance genes ,
which were Ts19 , Ts33 , W1Va 700 , LA1033 and L3708. The result indicated that the eight different physiological races were found out . Race T1 and T1 ,2 were widely distributed in 13 and 11 provinces with high frequencies of
28.8 % and 28.4 % respectively. Followed by T0 and T1 ,2 ,3 occurred in eight and seven provinces with frequencies of 1819 % and 819 % respectively. Then race T1 ,2 ,3 ,4 occurred in four provinces with 7 % frequency. The race T1 ,2 ,4 , T1 ,4 and T3 were narrowly distributed only in one or two provinces with 3.0 % , 2.5 % and 2.5 % respectively. This is the first report in China.

Key words: Tomato late blight, Physiological race, Differential host, Identification