12 



TIMOTHY EUST IN THE UNITED STATES. 



Some method of differentiating this rust in literature from the com- 

 mon graminis forms is necessary, however, and unless further experi- 

 ments should show that it can produce its secidium on the barberry, 

 and until such experiments have been performed, the writer favors 

 the use of the specific name Puccinia pMei-pratensis Erikss. and Henn. 



WINTER SURVIVAL. OF TIMOTHY RUST. 



In 1908 an effort was made to determine how the rust survives the 

 winter at the Arlington Experimental Farm. Timothy plants were 

 removed from the field on January 19 and March 12 and were imme- 

 diately potted and placed in a greenhouse at Washington, D. C, where 

 they could be carefully watched and any further development of rust 

 noted. Table II shows the results of these experiments. 



Table II. — Results of experiments on the winter survival of the rust of timothy. 



224 



