DUSTING AND SPRAYING EXPERIMENTS OF 1918 AND 1919. 



13 



The results from the use of dry lime-sulphur on Northern Spy in 1917 

 were not so satisfactory as where the standard lime-sulphur solution 

 was used. It was thought at that time that if the amount used in each 

 fifty gallons was increased so as to contain the same amount of actual 

 sulphur as is found in 1% gallons of standard lime-sulphur solution, 

 that the results would be better. Accordingly, it was used at two rates 

 in 1918. First, at the rate of 3 pounds in 50 gallons, which is the maxi- 

 mum strength recommended by the manufacturers, and second, at the 

 rate of 5% pounds in 50 gallons. This gave about the same amount of 

 sulphur as would be found in 1% gallons of lime-sulphur solution test- 

 ing 32 degrees Beaume. 

 Application. Four applications were made as follows: 



1st. Pink or cluster application. 



2nd. Calyx application. 



3rd. Two weeks after second. 



4th. First week in August. 

 All spraying was done with a spray gun and with high pressure. 



RESULTS 



Foliage Injury. There was very little foliage injury in any plot. The 

 foliage of trees sprayed with dry lime-sulphur was in slightly better 

 condition than where the standard lime-sulphur solution was used, but 

 the injury was so slight in any case that it was of little importance. 



TABLE V. RESULTS WITH BALDWIN AT GRAND LEDGE, 1918. 



Control The amount of scab on the check tree was so small 

 that no comparison could be made as to the fungicidal value of the dif- 

 ferent materials. Counts were made on the fruit from two trees in 

 each sprayed plot and from the check tree. The tabulated results of the 

 counts are shown in Table V. 



CALCIUM ARSENATE ON BEN DAVIS 



Materials. Rex calcium arsenate was used on a small block of Ben 

 Davis to determine its effect on the foliage and its insecticidal value. 



