Warty Disease of Potato. 
BY 
‘A. W. BORTHWICK, Sc.D. 
With Plate XXIII, 
The recognition of this disease is of comparatively recent date. 
It was first described by Schilbersky!. The infected tubers 
were sent to him from Upper Hungary. A few years later, 
Professor Potter? discovered the same disease in England, an 
outbreak having occurred in Cheshire. Dr. R. Stewart Macdougall’ 
has also recorded the occurrence of the disease in the same 
county. The Board of Agriculture has also issued a leaflet 
dealing with it. Further, several articles have appeared in the 
“ Gardeners’ Chronicle.” In one of these, Dr. M. C. Cook* 
mentions the disease as occurring in Cheshire, North Wales, and 
other localities, and according to information which I have 
recently received from Professor Potter, the disease is not unknown 
in the South of Scotland. The disease, therefore, is spreading, and 
it has undoubtedly reached the Midlands of Scotland, the illustra- 
tions accompanying this article being all taken from material sent 
from Stirlingshire. The disease is clearly rapidly spreading, and 
although it is not yet known to be doing an alarming amount of 
damage, still its continued increase is sufficiently ominous, and 
potato growers would do well to take warning in time and to 
exercise strict supervision of their crops. 
Attention was drawn to the outbreak in Scotland, to which I 
am about to refer, by Mr. Robert Forbes, Overseer of Kennet 
Estate, Alloa, who sent the diseased material to the Royal 
Botanic Garden along with the following description of its 
occurrence :— 
(Notes, R.B.G., Edin., No. XVIII, August 1907.] 
