New YorK AGRICULTURAL EXPERIMENT STATION. 249 
Late blight, early blight, flea bettles and tip burn were all factors 
in this experiment, but none of them caused much damage. Spray- 
ing controlled blight and flea beetles completely and tip burn par- 
tially. The loss from rot was negligible, only four rotten tubers be- 
ing found in the entire experiment. 
TABLE X.— YIELD BY SERIES AT RIVERHEAD IN 1900. 



‘SERIES. Rows. Dates of spraying. Yield per acre.\ 
Bu. lbs, 
ie eee 1,4,7,10and13.| June 12, July 18 and August 6........... ey ey be — 
1 aera Zoo Guang 4. shine 12°25. uly 10.25 and August 60. c+ ~. 203 45 
Peewee ooo, o.ioand 15-) Net sprayed. 224). oso lies. bot Ck. 150 30 


Increase in yield due to spraying three times, 211% bu. per acre. 
Increase im yield due to spraying five times, 53% bu. per acre. 
In the experiment at Riverhead the principal enemies were late 
blight and flea beetles, there being a moderate attack of both. Early 
blight was not sufficiently abundant to cause material injury. There 
was no loss from rot. 
‘DETAILS OF THE TEN-YEAR EXPERIMENTS IN _ 1907. 
AT GENEVA. 
In 1907, the experiment was carried out in practically the same 
“manner as in previous years. There were 15 rows* 290.4 feet long 
by three feet wide. Planting was done by hand May 22, in drills, 
the seed pieces being 15 inches apart. The variety was Rural New 
Yorker No. 2. The soil was heavy clay loam, well drained. The 
_ previous crop was clover. : 
The five rows constituting Series I were sprayed three times— 
twice with bordeaux mixture and paris green and once with 
bordeaux alone — the dates being July 15 and 24 and August 9. 
The five rows constituting Series II] were sprayed five times — 
twice with bordeaux mixture and paris green and three times with 
bordeaux mixture alone — the dates being July 15 and 24, August 9 
~ and 24 and September 17. 
The five rows constituting Series III (Check) were not sprayea 
‘at all with bordeaux mixture, but were treated twice (July 15 and 
24) with paris green in lime water to control bugs. 
“Besides the 15 rows in the experiment proper there were, as in all pre- 
vious experiments, {wo other rows which served the purpose of outside rows. 
