New YorK AGRICULTURAL EXPERIMENT STATION. ey 
SUMMARY OF RESULTS OBTAINED IN TEN-YEAR 
EXPERIMENTS PRIOR TO 1908. 
RESULTS IN 1902. 
TaBLE I.—YIELD BY SERIES AT GENEVA IN 1902. 


Series. Rows.! Dates of spraying. Yield per acre.? 
Bu. lbs. 
1 4 ae ae deaeoee any Lo. ae July 10723 andAug? 12.0.5), 317 41 
Diuretics. ax 2, 5,8 and 14....) June 25, July 10, 23, 30, Aug. 
12, 26 and Sept. 10...... 342 36 
i 0 p ee Oo Poms Loch mae N OG, BTA VEC Wylie nto en aes acre 219 4 

1 Rows 10, 11 and 12 omitted because of probable error. 
? The yields given in Tables I to XII relate to marketable tubers only. 
Increase in yield due to spraying three times, 984 bu. per acre. 
Increase in yield due to spraying seven times, 1234 bu. per 
acre. 

The unsprayed rows died two weeks earlier than the 
sprayed rows, owing chiefly to a severe attack of late blight. 
They were also somewhat injured by flea beetles, but there was 
no early blight. On unsprayed rows the loss from rot was 714 
per ct.; on sprayed rows only an occasional tuber. 
TaBLEe II.—Y1eLp By SERIES AT RIVERHEAD IN 1902. 



© 

Series. Rows. Dates of spraying. Yield per acre. 
Bu. lbs. 
1 eee 2, 5, 8 and 11....| May 26, June 20 and July 12) 295 20 
Ere dees... 1, 4, 7and 10....| May 26, June 3, 20, 30, July 
. Deyo oathl cao es Git bat 312 35 
BELS Pee". Oty, Goad cathe) WNOUSPIAVed oso. 45 55% ce eh 267 40 

Increase in yield due to spraying three times, 27% bu. per acre. 
Increase in yield due to spraying seven times, 45 bu. per acre. 

In this experiment there were only traces of early blight 
and no late blight. The larger yield on sprayed rows was due 
to partial protection against flea beetles which were rather 
plentiful at times. There was no rot. 
