EXPERIMENT STATION BULLETINS. 



371 



were new sprouts coming up as late as July 0. As a result of this 

 unusual damage the difference in yield during this test is considerably 

 in favor of the spring planted potatoes. I^vel cultivation gave much 

 better results than hilling up, though the showing was made possible 

 by tlie cutworms rather than by the method of cultivation. On the 

 other hand it is well to bear in mind that the hilling up method in this 

 and former tests was generally preceded by four level cultivations and 

 was thus given a greater advantage than it receives at the hands of 

 those who practice it and who rarely cultivate at first more than once, 

 following this by hand hoeing. The most striking results were those 

 obtained from spi'aying with Boj'deaux Mixture, for the difference in 

 this case would have been much larger had it not been for the cut- 

 worms, whose damage was principally confined to the sprayed portion 

 of the fall planted potatoes. Even as it is, the difference of 97 pounds 

 in favor of spraying is equal to an increase of over 22 bushejs per acre. 

 As the cost of the material added to the Paris green would not exceed 

 70 cents per acre, and the labor, if the potatoes are otherwise sprayed 

 for bugs, would be practically the same, it is easy to figure out whether 

 or not it pays to spray. The time of sprouting and blossoming is given 

 in the following table: 



The potatoes were cultivated June 15, 22 and 30, July 9 and 18; the 

 hilling up being done on the last day, and the other half of the plot 

 receiving two more level cultivations July 25 and August 2. The spray- 



ing was done June 25, July 5, 10 and 26, 



Auaust S and 20. 



