186 IOWA ACADEMY OF SCIENCE Vol. XXVI, 19iy 



one-half mile from the Lutheran church. The roadside was abun- 

 dantly grown over with Agropyron rcpcns and A. teneritm, there 

 was also some late oats in a few places, lliese plants were all badly 

 infected with P. graminis. I did not know at the time that there was 

 any barberry in the vicinity. Two months later there was located 

 the barberry bush which accounted for the heavy rust infection in 

 that vicinity. 



The Chan per Place, Hancock county. — I found some bushes of 

 the common barberry, one and a half miles south of Forest City in 

 Hancock county. Immediately south of the place was a barley 

 field. Old aecia occurred in abundance on the barberry leaves. The 

 barley was badly rusted as was the Marquis wheat, one-fourth of a 

 mile a way. The Agropyron tencrum, A. re pens, Hordeum juhatum 

 on the road near the barberry bushes were all badly rusted. The 

 infection on these grasses could be traced along the highway for 

 800 feet. 



At Northtvood, lozva, the rust on Hordeum juhatum and Agro- 

 pyron repens was easily traceable to the hedges on the Mrs. Butler 

 place and another hedge near the Minneapolis & St. Louis Railroad. 



At Spirit Lake and Lake Park there was an abundance of rust 

 on volunteer oats, Agropyron Smithii, A. tenerum, wheat, and Ely- 

 mus Macounii. According to Mr. Sawhill all barberry plants were re- 

 moved in April. I am, however, inclined to think that some bushes 

 were overlooked. The infection of grain probably came from the 

 wild grasses. At Lake Park, Green Russian oats and Spring wheat 

 where they were lodged were badly rusted. I did not see any bar- 

 berry. All of the barberry plants were said to have been removed 

 early in the spring. I have my doubts about this. 



Sibley, Osceola county — An active campaign to remove the bar- 

 berry was carried on in the spring and I was informed that there 

 were none in the vicinity. Wheat and oats were badly rusted, but 

 there was an abundance of P. graminis on Hordeum juhatum, Agro- 

 pyron Smithii, A. repens, A. tenerum and some on H. Pammeli. 

 These rusted plants were all found in the same vicinity. It occurs 

 to me in this case that some aecia were produced infecting the 

 plants or some of the barberry plants which" were overlooked. 



Rock Rapids, Lyon county — I observed a great deal of rust on 

 Hordeum juhatum and Agrostis alha m the vicinity of the city library 

 at Rock Rapids. A little search revealed the presence of barberry, 

 several clumps, in the yard of the public library. This accounted for 

 the abundance of rust for several blocks in the vicinity. Old jecia 

 were common on the barberrv. I made a count of the infected leaves 



