APPLE SPRAYING EXPERIMENTS IN I914. IQI 



As might be expected the stronger Hme-sulphur has invari- 

 ably produced better scab control than the standard dilution. 

 In 1912 when scab was more severe this increase in efficiency 

 much more than paid the extra cost for spraying material. 



Lime sulphur vs. bordeaux mixture. As has already been 

 stated plots i and 4, particularly the former, were introduced 

 chiefly for the purpose of comparison. Attention is called to 

 the fact that again bordeaux mixture showed the greatest effi- 

 ciency in scab control, but far outranked all of the other 

 spraying materials in the amount of russeting produced. On 

 account of russeting only a little over 10 per cent of perfect 

 apples were obtained where bordeaux mixture was apphed while 

 nearly 94 per cent of the same grade of fruit was harvested 

 where the standard dilution lime-sulphur was used. 



"Soluble Sulphur." The results secured in 1914 with this 

 material fully confirm the tentative conclusions derived from 

 the experiments of the previous year and from letters received 

 from orchardists who used Soluble Sulphur as a summer spray 

 that season. Even when reduced to three-fourths pound and 

 used with one pound of dry arsenate of lead in 50 gallons of 

 water 'it again produced most serious defoliation. In view of 

 these results it therefore cannot be recommended and cannot be 

 used with safety with arsenate of lead as a summer spray for 

 apple trees. 



In justice attention should be called to the fact that during 

 both seasons in which this material has been tested very efficient 

 scab control has been secured and the amount of fruit russet- 

 ing compared very favorably with that resulting from the use 

 of standard dilution lime-sulphur. 



"Atomic Sulphur." The condition of the fruit at harvest 

 time on the plot sprayed with this material was, as in the case 

 of the previous season, quite satisfactory. Scab control on the 

 fruit was very efficient and the amount of russeting was actually 

 less than on the unsprayed check plot. The control of scab 

 on the leaves was by no means as good as the previous season. 



Arsenate of lead as a fungicide. The results secured in 1912 

 and 1913 indicated that arsenate of lead for apple scab has con- 

 siderable fungicidal value. Our attention was first called to 

 this fact Avhen it was found in 1912, a season in which scab 

 development was particularly severe, that a plot sprayed with 



