A Dry Rot of the Irisli Potato Tuber 
59 
It will be noted that the simple removal of the skin supplied 
as suitable a means of entrance for the fungus as did punctures. 
No infection occurred thru the scab spots nor thru the uninjured 
surface. The rot developed more slowly than it does in more 
matured tubers. 
Fig 15. Rotted tubers cut open to show the frequent occurrence of a 
concentric arrangement of the rotted areas. 
NATURAL FIELD INOCULATIONS. 
During 1909, extensive experiments were conducted at Alliance 
to test the effect of planting rotted seed pieces in the hills. This 
was designed to throw light upon the question of natural infection 
under field conditions and the value, if any, of Bordeaux spraying. 
For this experiment, the following varieties were used : 
(1) Acme. 
(2) Rural New Yorker. 
(3) Early Ohio. 
(4) Red "River Valley Ohio. 
The Rural New Yorker potatoes employed were purchased in 
the Lincoln market; the Red River Valley Early Ohio potatoes 
were purchased in the Alliance market; the Acme potatoes had 
been grown by W. A. Springer of Alliance, while the Early Ohio 
potatoes were grown by Wm. Lorance of Alliance. 
The arrangement of the rows and the nature of the treatment 
each received is shown in the following table : 
