¢ 
50 STORRS AGRICULTURAL EXPERIMENT STATION. 
Microscopical examination showed these spots to be the early 
stages of rot, caused by late blight. The potatoes from both 
plots were put in crates, labeled, and placed in a cool room to 
await developments. 
November 1 the potatoes from both plots were carefully ex- 
amined and counted. ‘The colored spots on the surfaces of the 
potatoes had in most cases developed into a dry, black rot. 
Although at time of digging no rot spots were noticeable on 
potatoes from the sprayed plot, 2.5 per cent. of them now 
showed more or less of the dry rot. Of those from the un- 
sprayed plot, 26 per cent. were badly decayed. 

Fic. 14. Section of potato decayed by late blight. 
The results of spraying potatoes with Bordeaux in 1904 gave © 
evidence that blight can be controlled. In the spring of 1905 
the experiment was continued. Twenty-nine rows of. Green 
Mountain potatoes were planted May 13. This area was 
divided into four plots of six rows each with check rows for 
each side and between the plots. 
‘ 
One object of the experiment was to ascertain the leas 
number of applications of Bordeaux that would be necessary 
to prevent loss from blight. The following table gives the 
number and dates of applications to each plot and the yield of 
potatoes: 
