212 Report of the Botanical Department of the 



RESXJLTB IN 1903. 

 Table III. — Yiexd by Series at Geneva in 1903. 



Series. 



I . 



U... 



III... 



Rows. 



1,4. 7, 10 and 13. 



2, 5, 8. 11 and 14. 



3. 6, 9. 12 and 15. 



Dates of spraying. 



Jidy 14, 28 and Aug. 26 



July 7, 21, Aug. 7, 21 and Sept. 3 

 Not sprayed 



Yield per acre. 



Bu. 



262 

 292 



174 



lbs. 



10 

 20 



Increase in yield due to spraying three times, 88 hu. per acre. 

 Increase in yield due to spraying five times, 118 hu. per acre. 



Three sprayings prolonged the life of the plants 11 days; five 

 sprayings, 18 days. There was no early blight and the injury 

 from flea beetles was only slight. Late blight was again the chief 

 enemy. The loss from rot was even less than in 1902. 



Table IV. — Yield by Series at Rivebhead in 1903. 



Increase in yield due to spraying three thnes, 39^ hu. per acre. 

 Increase in yield due to spraying five times, 56 hu. per acre. 



The sprayed rows outlived those unsprayed by several days. 

 Late blight and flea beetles were the chief enemies. Early blight, 

 also, caused slight damage. On the unsprayed rows the loss from 

 rot was 2 per ct. ; on those sprayed, practically nothing. 



