4! 



erum) especially to the latter species. Squirrel-tail grass 

 (Hordeum jubatum) was also very badly affected. Several 

 farms were noticed where wheat grass and squirrel-tail were 

 so badly affected that there is no doubt that their stems and 

 leaves contained enough rusts pores to "seed" thousands of 

 acres of grain. Were these grasses carefully collected and 

 burned most of these spores would be destroyed. It is prob- 

 able that such grasses as these aid materially in causing many 

 damaged fields of grain. 



PUCCINIA PRTINI, Pers. Plum rust. III. On leaves of wild plum 

 (Primus americana). Rare. It is very injurious when abund- 

 ant. 



PUCCINIA STIPAE, Arthur. III. On porcupine gmss(Stipa spartea). 

 It causes but little damage. 



PUCCINIA VIOLAE, (Schum.) DC. Violet rust. I-IIL On leaves 

 of common wild violet (Viola cucullata). It often becomes 

 very injurious. May July. 



ACCIDIUM FBAXINI, Schw. Ash rust. On leaves and petioles of 

 green ash (Fraxinus viridis) Quite common and destructive. 

 Often greatly distorting the affected parts. June July. 



AECIDIUM GROSSULARIAE, Schum. Gooseberry or currant rust. 

 On leaves and berries of common gooseberry (Ribes rotundi- 

 folium), and black wild currant (Ribes floridum). Abundant. 

 Very destructive, especially when the fruit is affected. Many 

 bushes were noticed with scarcely a leaf or fruit unaffected. 

 May July. 



UREDO CAEOMA-NITENS, Schw. Blackberry and Raspberry rust. 

 Covers the whole under surface of the leaves with an orange 

 red powder (the spores). Does much damage to the host 

 wherever found. Happily it is as yet quite rare here. 



USTILAGINEAE. THE SMUTS. 



USTILAGO AVENAE, (Pers.) Jensen. Loose smut of oats. In 

 heads of oats, causing them to turn to a black powdery mass, 

 totally ruining the grains. Quite common and very destruct- 

 ive. Damaged some fields considerably this year. 



