24 f- U-& U &j ^I'J o »f 9£ 



sistant to our disease, were tested in this e.\-[jeriiiicnt. Four varieties or strains, 

 Argentine (Micnkv), Cayagneo, Ottawa 770 B and Argentine Sei. proved to 

 be perfectly immune. On .several cotyledonous leaves of "Wiiliston Goldea", 

 however, minute ured>xsori appeared, but they did not develoj) to any extent. 

 The leaves thus affected by the fungus soon fell off. "I'crnau" (T) used for 

 control was severely affected. The results are shown in the following table. 



Table XXV. A\:s//Us of Experiment XI. 



(Inoculation experiments made in the green-house) 



„, ^ . . ., , ( Maximum 34°C. 



The temperature in the green-house ( ,^. . , on 



' *= (^ Minimum I2°L. 



IX. Varieties and Strains Resistant or Immune to the Flax Rust. 



In 1923, J. C. Dokst'^ reported on the resistance to the flax rust of several 

 s'.iains of white flowering fla.x, free from rust in a field severely attacked by 

 the rust. 



In the next )'ear, A. W. Hexkv"' reported that several immune or highly 

 resistant seed-flax varieties had been found at St. Paul, Minnesota, U. S. A., 

 and he added that numerous strains of large-seeded, blue-flowered Argentine 

 race are immune and some also are wilt-resistant. 



H. D. Barker"'^ also rejiorted that "Chippewa" is not only resistant to wilt, 



ij 1. c. 

 2, 1. c. 

 3) Minn. Agric. Exper. Stat. Tech. P,ull. X.K (1923). 



