REPORT OF THE SOCIETY 31 



In New York they had no injury from burning but in a number of other 

 places in the United States burning did result just as it did with me. 



My conclusions therefore drawn from my experience and that of several 

 other entomologists are, that if spraying of apples is well done, the spreader 

 is not necessary and will not pay. 



Dry Lime-Sulphur as a Substitute for Liquid Lime- Sulphur 



The Canada Paint and Sherwin Williams Company are selling a dry lime- 

 sulphur which is in the form of a fine orange-yellow powder which dissolves 

 readily in water. When arsenate of lead or arsenate of lime is added to the mix- 

 ures the colour still remains a much deeper yellow than in the case where 

 liquid lime sulphur and these poisons are mixed together. 



I tested this dry lime-sulphur this year on seventeen Mcintosh trees, using 

 it not at the strength which the company recommends bu\t roughly at a strength 

 worked out in conjunction with our chemist after he had made analysis of the 

 substance. In the first application I used 6^ pounds to 40 gallons of water and 

 applied it soon after the buds had burst; in the second application 5 pounds were 

 used and applied just before the blossoms opened; and in the third application 

 4 pounds and applied just after the blossoms fell. One pound arsenate of lime 

 and 4 pounds hydrated lime were added to every 40 gallons in the 2nd and 3rd 

 applications. 



Though the conditions were very favorable for scab the trees sprayed with 

 this substance were just as free from the disease up to July 1st as those sprayed 

 with the liquid lime sulphur, the average scab on this row and the rows alongside 

 being a little over 3%. But after July 1st there was a decidedly heavier out- 

 break of late scab on this row than on any other of the 32 rows in the orchard. 

 This would tend to indicate that the spray did not adhere so well or have such 

 a lasting effect as the liquid lime-sulphur. Yet perhaps it is scarcely fair to 

 draw definitie conclusions from one year's experience.. However as dry lime 

 sulphur is a very convenient-type of spray material I believe we ought to test it 

 outfurther and 9ec whether at a greater strength it will prove satisfactory. It 

 would be especially convenient for owners of small orchards or of a few threes in a 

 garden and would be sold by merchants in small towns who would not handle the 

 liquid mixture. 



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Mr. Fetch — Dry lime sulphur has given me very poor results. 

 Mr. Caesar — What strengths did you use ? 

 Mr. Fetch — The strengths recommended by the manfufacturers. 

 Mr. Caesar — I think that in the past these have been too weak. 



