REPORT OF THE SOCIETY 95 



The average cost of 100 gallons of the mixtures for the past 4 years has 

 been as follows : 



YEAR PLOT 1 PLOT 2 PLOT 3 PLOT 4 



1919 5.00 4.31 4.32 3.93 



1920 5.43 5.91 4.44 3.93 



1921 3.37 4.85 3.74 3.91 



1922 3.24 6.09 3.62 3.35 



Average 4.26 4.79 4.03 3.78 



During this four year period the injury to the foliage has been sHghtly more 

 in the lime sulphur plots but this has been far surpassed by the injury to the 

 fruit by the use of Bordeaux mixture. The Bordeaux mixture used was not the 

 ordinary 4 — 4 — 40 but one containing a small amoHint of copper sulphate and an 

 excess of lime. Bordeaux injury was most injurious when wet weather followed 

 the application. Considerable trouble is experienced through clogging nozzles, 

 etc. when using this Bordeaux because of the large amount of lime present. It 

 is usually more costly and not as convenient to use as lime sulphur. This past 

 year the Bordeaux sprayed plot had 6% o| scab whereafe the lime sulphu,r plots 

 had less than 4%. This result was due to the use of soluble sulphur in the' 

 calyx spray, and to our infestation of scab coming between the calyx and after 

 calyx applications. It would seem the use of soluble sulphur for the calyx 

 spray is the great weakness of the Nova Scotia spray calendar and this point 

 would have been more clearly brought out if there had been a heavy infestation 

 of scab here this past year. 



Calcium arsenate has given equal results to lead arsenate in insect contro i 

 but it has advantages which make it preferable. It is less costly and does not 

 cause any appreciable chemical change when mixed with lime sulphur. In 1921, 

 lead arsenate in eombination with lime sulphur injured a large number of apples 

 chiefly at the calyx end. The injury was usually in the form of a circle but in 

 severe cases streaks formed on the sides of the apples. The skin was cracked 

 and turned to a dull brown color. This type of injury did not occur in orchards 

 sprayed with calcium arsenate and lime sulphur. 



Dry lime sulphur has been tested the past two years on Mcintosh and Fa- 

 meuse apples with the following results : 



1921. Dry lime sulphur 2 lbs — water. ...40 gals. (3 apphcations) 



Fameuse 39.9% scab 



Mcintosh 3.45% scab 



1922. Dry lime sulphur 3 lbs to 40 gals water (3 applications) 

 Fameuse 14.0% scab 



Dry lime sulphur 4 lbs — 40 gals water (3 applications) 



Fameuse 11-1% scab 



Mcintosh 20.8% scab 



