New York Agricultural Experiment Station. 223 



The five rows sprayed three times constitute Series I and the 

 average yield of these rows makes the yield for Series I. The 

 yields given for Series II and III have been computed in the same 

 way. The yield by series is shown in the following table : 



Table XX. — Yield by Series at Geneva in 1911. 



* Marketable tubers only. 



Increase in yield due to spraying three times, 40 hu, per acre. 

 Increase in yield due to spraying seven times, 93 hu. per acre. 



at riverhead. 



With minor variations the experiment at Riverhead was car- 

 ried out in the same manner as the one at Geneva. The potatoes 

 were of the variety Carman No. 1. They were planted April 14. 

 The soil was sandy loam. 



The five rows of Series I were sprayed with bordeaux mix- 

 ture three times — May 30, June 24 and July 12. 



The five rows of Series II were sprayed with bordeaux mixture 

 five times — May 30, June 14, 28, July 12 and 26. 



The five rows of Series III (check), received no bordeaux. 



Bugs were controlled with paris green used at the rate of one 

 and one-half pounds to fifty gallons. On Series I and II it was 

 applied with the bordeaux three times and on Series III twice 

 (June 24 and July 12), with lime water. 



In this experiment flea beetles were plentiful. There was, also, 

 a little early blight, but no late blight and no rot. The chief cause 

 of the low yield was the severe drought which brought about the 

 premature death of the plants on all three series. Table XXI 

 shows the yield by rows and Table XXII the yield by series. 



