184 Report of the Botanist of the 



teleutospores. found were a few belonging to Chnjsomijxa albida. 

 We were finally obliged to refer the rust to Dr. W. G. Farlow, 

 who informs us that it is Vredo miiUeri Schroet. It is known 

 only in the uredo stage. 



This rust wa.s very abundant in three large plantations, all on 

 one farm, but we have not seen it anywhere else on cultivated 

 blackberries except at the Station where perhaps half a dozen 

 leaves were affected by it. In the plantation in which the rust 

 was first discovered and where it was most abundant there are 

 two kinds of soil — light sandy soil and sandy loam. On the 

 former, almost every leaf was affected; while on. the latter the 

 plants were practically free from rust until in September, and 

 even then they were very much less rusted than plants in the 

 sandy soil. In one of the other plantations the rust was most 

 abundant on a sandy knoll. It is plain that it has a preference 

 for plants in sandy soil.^i 



There is no cause for alarm at the appearance of this black- 

 berry rust. It is not new but simply an unusual outbreak of a 

 fungus which has long been known to attack blackberries occa- 

 sionally. In case it should become abundant it is improbable 

 that it would cause much damage. The owner of the affected 

 plants says that they have been yellow with the rust every fall 

 for several years, but it does not seem to injure them. It ap- 

 pears too late in the season to do much damage. 



Leaf Spot (Scptoria ruU Westd.). — Leaf spot has been of quite 

 common occurrence on blackberries, but we doubt if it has done 

 any material damage to them. It was observed that on different 

 varieties the fungus may produce quite different spots. On 

 some varieties the spots are light brown, while on others they 

 are dark brown. Sometimes these differences are so marked 

 that at first we suspected that the two kinds of spots were 

 caused by different fungi, but we found only Scptoria ruU upon 

 them. 



"Stone & Smith (Twelfth Ann. Eep. Mass. (Hatcb^ Exp. Sta., pp. Gl-73) 

 have observed that tlie same is true of asparagus rust 



