STATE POMOLOGICAL SOCIETY. 77 



A COMPARISON OF LIME-SULPHUR SPRAYS OF DIFFERENT 



STRENGTH. 



In order to determine whether a Hme-sulphur spray stronger 

 than that usually advised is necessary, a series of tests were 

 conducted on a Spy block in Berwick, using i to 30, i to 35, and 

 I to 40 strength throughout the season. Arsenate of lead, 2 lbs. 

 to 40 gallons, was used in each case. It would appear that the 

 I to 40, or the one having a specific gravity test of 1.007, i^ 

 practically as efiiective as the stronger lime-sulphur. Three 

 applications were made, one just before the blossoms opened, 

 June 2, and two after, June 23 and July 10. 



% Scab. 

 1.009 specific gravity test, or approximately i to 31 . . . 0.18 



1.008 specific gravity test, or approximately i to 35. . . 0.15 



1.007 specific gravity test, or approximately i to 40. . . 0.49 

 No spray 1Z-^7 



A COMPARISON OF LIME-SULPHUR ARSENATE OF DIFFERENT 

 STRENGTHS FOR THE FIRST SPRAY. 



To find out whether a strong lime-sulphur spray for the first 

 application will control scab better than a weak one a series of 

 tests were made on Kings and Gravensteins at Berwick, and on 

 Baldwins at Bridgetown. The trees were sprayed three times 

 and the difference in strength of mixture was confined to the 

 first spray before the blossoms opened, May 28. The appli- 

 cations following this were alike. The results obtained were as 

 follows : 



Kings. % Scab. 



1. 014 Specific gravity, or i to 20 .J'J 



1.009 Specific gravity, or i to 31 1.92 



1.008 Specific gravity, or i to 35 1.07 



No spray 34-91 



Gravensteins. % Scab. 



1. 014 Specific gravity, or i to 20 0.61 



1.008 Specific gravity, or i to 35 5.52 



No spray 60.98 



Baldwin. 



1. 014 Specific gravity, or i to 20 0.56 



1.008 Specific gravity, or i to 35 1.32 



No spray 22.5 



