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Journal of Agricultural Research 



Vol. X, No. 9 



Table VI. — Results of inoculations with urediniospores from Agropyron tenerum Vasey 



» p. graminis iritici; both transferred readily to wheat, not rye. 



Inoculations on Agropyron tenerum with known strains of P. graminis 

 triiici and P. graminis secalis show very clearly that it is very susceptible 

 to both forms, thus confirming the results of the inoculations with rust 

 collected in the field (Table VI). 



Agropyron tenerum is almost always rusted, sometimes very severely. 

 In the summer of 191 6 especially it was almost universally very heavily 

 rusted in Minnesota, North Dakota, Montana, northeastern Wyoming, 

 northwestern Nebraska, and northern Iowa. The same was also true in 

 the Red River Valley in Manitoba, at least as far north as Winnipeg. In 

 191 5 the grass was severely rusted in Minnesota and North Dakota, and 

 very probably throughout the northern wheat-growing area. 



