180 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



(jraniinis occurred on Acjropyron SmitJiii and A. tcnenmi in the 

 vicinity. 



' Triticiiin vnlgarc Vill, is generally cultivated in the region. Its 

 cultivation in Iowa in 1918 was quite general and in Minnesota and 

 South Dakota it was grown extensively. Winter wheat is grown most 

 extensively in southern Iowa and along the Mississippi, as far north 

 as La Crosse, Wisconsin; Winona, Minnesota, and along the Mis- 

 souri to Sioux City, as well as in eastern Nebraska, Illinois and 

 Missouri. Pnccinia graminis is common on this host throughout the 

 region. In the winter wheat section only a little rust occurred on the 

 host in the southern part of the state as at Indianola, Burlington, 

 Ottumwa and Keokuk, but the damage was not great. The govern- 

 ment advised the planting of spring wheat in spring grain areas of 

 Iowa. Acting on the advise of the government and the Extension 

 Department of the college, small areas were planted to spring wheat 

 in many sections of the state, where for many years spring wheat 

 had not been grown. Many farmers used Marquis, which is less 

 rusted than most other spring varieties, because of its earliness. The 

 Velvet Chaff, for instance at Britt, Duncombe, Forest City and 

 Lake Mills in Iowa was much more rusted than Marquis. At 

 Sanborn and Graceville, Minnesota, Velvet Chaff in some places was 

 badly rusted, while there was little rust on Marquis. It is also note- 

 worthy that oats (Avcna saliva) when grown under the same con- 

 ditions at all of the above points, had less stem rust than wheat. In 

 most cases only slight injury resulted. The early oats practically 

 escaped rust in most instances. , 



Sccale ccrcalc L. This cereal is not common in Iowa, except on 

 sandy soils in eastern Iowa from INIuscatine northward, through 

 Clinton, Dubuque, Clayton and Allamakee counties in Iowa and 

 north to La Crosse and Trempleau counties in Wisconsin. It is com- 

 mon also on sandy soil in southern Minnesota, and west to Graceville 

 and Ortonville and to South Dakota. In Iowa winter rye is not an 

 important agricultural crop. The winter rye crop was not seriously 

 injured by Pnccinia graminis in Iowa. A little was noted at Clinton 

 and in Dickinson counties. This rust was not serious in western 

 Minnesota at Sanborn, Graceville and Ortonville. The same condi- 

 tions prevailed at Watertown, LaBolt, Mitchell, Sioux Falls and 

 Brookings, South Dakota. 



Elynius Macounii Vasey. This wild rye is common from northern 

 Iowa to Minnesota and westward, especially in prairie regions. The 

 species occurs from Hamilton county. Iowa, northeast through 

 western Hardin and Franklin, Cerro Gordo and Worth counties, 



