NATIVE GRASSES AND PUCCINIA GRAMINIS 



189 



badly infected with P. graminis. A field of wheat of the variety 

 known as Gold Drop on the farm of William Nissley 460 feet to the 

 west of the barberry hedge was badly rusted. Mr. Pickford, the 

 county agricultural agent, said it was the most severely rusted field 

 of wheat in the county. It may be noted here that farm buildings 

 occurred between the barberry hedge and the field of wheat. 



The JVaukon, Postville, McGregor and Clermont Cases — These 

 cases are all of interest because of the presence of wild barberry in 

 all of these places, except the Waukon locality. A barberry hedge 



Dr. Pawnor d 



Home. 



D 



Ovja 





Hi 11/ Vh'V -tUt/IUI 



riain St. 





4 



R.C. 

 Chvrch 



^ 





l>v. ..// W 1> 'f/ 



Bi 



1^ -^ 





1/V ^"v-'V 



■■1/ ,'ji ... 



H 





le -grass 



ifitti'k-M l\»<nii(fi.iii 



^^ fc l„ l tf ),^ll j i l^ 



-o O ,-J 



Qua.ch 



N^Hl'Pl' \,l »/•>/ 



VAU>CON 



Fig. 50. — Barberry hedge and relation to Barberry of abundance of rust on 

 streets near hedge, Waukon. (C. M. King.) 



some fifty feet long in the city of Waukon was next to a vacant lot 

 covered with timothy and red top with some quack grass in the 

 street and on the lot adjacent to the street. Piiccinia grauiinis was 

 abundant on the culms of quack grass, in fact it was literally covered 

 with rust. It was also found that quack grass in the streets for 



