32 



CEREAL RUSTS OF THE UNITED STATES. 



Tai5LE 3. — Comparatire amount of Uredo nibi'io-reru on different rarieties of wheat- 

 Continued. 



A careful study of the table will show what a great variation there 

 is in the ability of the same variety to resist or escape rust under dif- 

 ferent conditions. Some varieties that were almost rust free in 1895 

 were badly rusted in 1890 and 1897, while others rusted less during the 

 last two years than in 1895. Another important conclusion to be drawn 

 from the experiments is that no ordinary variety of wheat is absolutely 

 rust proof. Even the variety Einkorn above mentioned, which is not 

 really a true wheat, succumbed to the stem rust (P. (jraminis) in 1896. 

 Nevertheless the fact remains that some varieties are better able to 

 escape or resist rust than others under the same conditions and in the 

 same locality, and that some are c^uite resistant, at least comparatively 

 speaking, in all localities and under all conditions, and it behooves the 

 grower to know these varieties. 



Characteristics of icheats resistant to orange leaf rust. — This is a sub- 

 ject of great interest and has already been discussed to some extent by 



