New York Agricultural Experiment Station. 215 



RESULTS IN 1906. 

 Table IX. — -Yield by Sebies at Geneva in 1906. 



Increase in yield due to spraying three times, 31f hu. per acre. 

 Increase in yield due to spraying five times, 63 hu. per acre. 



Late blight, early blight, flea beetles and tip burn were all 

 factors in this experiment, but none of them caused much damage. 

 Spraying controlled blight and flea beetles completely and tip 

 burn partially. The loss from i-ot was negligible, only four rot- 

 ten tubers being found in the entire experiment. 



Table X. — Yield by Series at Riverhead in 1906. 



Increase in yield due to spraying three times, 21^ hu. per acre. 

 Increase in yield due to spraying five times, 53^ hu. 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 in- 

 jury. There was no loss from rot. 



