SPRAYING NOTES FOR 1904-1905. 49 
sprayed plot. At the time of the first killing frost, September 
21, the unsprayed plants were all dead and to all appearances 
had ripened naturally. The sprayed plants were green, growing 
well, and would probably have increased for a week or more 
had the frost held off. 

Fic. 13. Potato plots; sprayed at right, unsprayed at left. 
Both sprayed and unsprayed plots were dug October 3. 
The yields were as follows: 
Sprayed plot, 14 bushels, large. 
Sprayed plot, 11% bushels, small (none rotten). 
Unsprayed plot; 714 bushels, large. 
Unsprayed plot, 1% bushels, small, 
A few too badly decayed to handle. 
Yield per acre, sprayed, large, 337 
Yield per acre, sprayed, total, 376 
Yield per acre, unsprayed, large, 180 
Yield per acre, unsprayed, totale 2 07 
At the time of digging many potatoes from the unsprayed 
plot had irregular purple or brownish spots on their surfaces. 
When cut into these spots showed discoloration extending into 
the tissue of the potato about one-quarter of an inch. 
t 
