132 



EXPERIMENTAL FARMS 



4-5 EDWARD Vll., A. 1905 

 Table I. — Experiments in Spraying to prevent Blight and Rot of Potatoes. 



In the above table the fifteen varieties were divided and the results from spraying 

 the main crop varieties averaged and kept separately from the early ones. This was to 

 show which were influenced most by spraying. It will be seen that the main crop 

 varieties were much more influenced this year than the early, the average greatest 

 increase of the main crop varieties being at the rate of 140 bushels 48 pounds per acre, 

 and of early varieties only 44 bushels per acre, or an average of both of 92 bushels 24 

 pounds per acre. This great difference -^as probably due to the fact that this year 

 the blight did not appear until well on in August, when the crop of the early varieties 

 was well advanced. Taking the average of the years 1901, 1902 and 1904, the increase 

 in crop from the use of Bordeaux mixture has been 94 bushels 30 pounds per acre. 



In 1902 there was an average increase from the use of Bug Death over Paris Green 

 of 61 bushels per acre, but in 1904 there was practically no increase. There was more 

 rot in the plots treated with Bug Death in 1904 than in those where Paris Green was 

 used, which is difficult to account for as the soil was of a uniform character. In 1902 

 the amount of rot was about the same in both plots. 



