From thirty-eight collections of Melampsora lini (Ehrenb.) Lév. from crops grown in Northern Ireland, England, Scotland, Wales and Pakistan, seventeen physiologic races have been distinguished by the reaction of seventeen differential flax varieties including nine new races designated by the letters A to J. No difference in susceptibility or resistance was found when plants were inoculated at the ages of 10 or 30 days. Some of the physiologic races are fairly widely distributed. When tested under greenhouse conditions all the fibre varieties of flax commonly grown in the United Kingdom were susceptible to all the races isolated during the investigation. Certain imported varieties of fibre flax, including Textilschchik, Stakhanovets, Wada, 1288/12 and U.S.S.R. no. 2 (ex Dugejheshchya), were immune or highly resistant to all races in greenhouse tests. Varieties susceptible in greenhouse tests were also susceptible in the field when inoculated with the same races at various stages before flowering, but were resistant if inoculated after flowering.

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melampsora lini ehrenb

A.G. Arif,.A study of physiologic specialization of the flax rust, Melampsora lini. 37 (4),353-361.

A.G. Arif,"A study of physiologic specialization of the flax rust, Melampsora lini" 37

A.G. Arif,"A study of physiologic specialization of the flax rust, Melampsora lini"