New York Aoricultukal Experiment Station. 



833 



Table I. — Results of Double-Spraying as Compared with SiNQLE-SpRATiNa 



* There were three tests — one sprayed five times, the others seven times. 



In this table the column " Expense of single-spraying " indi- 

 cates the added cost of the second application, by which the acre- 

 age increase (or decrease) shown in the previous column was 

 secured. This cost was taken to be the same as that for a single 

 application. It will be noticed that even in these very unfavor- 

 able seasons the double sprayings increased the average yield 

 over the single sprayings two-thirds as much as did the single 

 sprayings over no spraying. It is plainly the rule in potato 

 spraying, as in most farai operations, that " thoroughness pays." 



The last year, 1911, of the ten-year series 

 of potato-spraying tests was very unfavorable 

 to the potato crop, and to benefit from spray- 

 ing, during the early part of the season, owing 

 to the excessive heat and drought ; but abund- 

 ant rains later, with holding off of frost at Geneva until October 

 2Y, resulted in good yields. Tip burn was the worst trouble at 

 Geneva, and this was apparently somewhat checked by spraying. 



27 



Results in 



ten-year 



series. 



