New York Agricultural ExrBRiMBNT Station. 501 

 Yield per Plot. 



Plot I. Sprayed live times... 



Plot II. Nob sprayed 



Plot III. Sprayed three times 



Total. 



270 bii. 

 182 " 

 272 " 



Merchantable 

 tubers. 



257 bii. 

 164 " 



242 " 



Small 

 tubers. 



i:? l.u. 

 18 " 

 30 " 



Increase in yield due to spraying with Bordeaux mixture five 

 times, — sixty-two bushels of merchantable txihers per acre. 



Increase in yield due to spraying with Bordeaux mixture three 

 times, — fifty- two bushels of merchantable tubers per acre. 



Difference between three and five sprayings, — ten bushels of mer- 

 chantable tubers per acre. 



As previously stated, no late blight appeared. The increased 

 yield on the sprayed plots is due to the fact that the Bordeaux 

 mixture prevented the early blight* and gave more perfect pro- 

 tection against flea-beetlesf and Colorado beetles. 



I am convinced that many farmers who spray potatoes do not 

 use enough Bordeaux mixture to get the best results. The object 

 should be to keep the entire foliage at all times covered with the 

 fungicide. A few drops of poison on the upper leaves may do 

 for insects — they will eat of the poison and die; but against fun- 

 gous diseases each leaf must be protected individually. When 

 horse machines are used there should be at least two nozzles, and 

 better yet, three nozzles for each row. If using a sprayer which 

 has but a single nozzle to the row it is best to go over the ground 

 twice. Vermorel nozzles are the best for spraying potatoes. The 

 quantity of liquid required for an acre may be computed from the 

 number of nozzles to the row. If one nozzle per row is used, 



* Macrosporiuin Solani E. & M, 

 t Crepidodera cucuineri Harr. 



