SPRAYING EXPERIMENTS AND APPlwE DISEASES. 17 



described was sufficient to indicate that arsenite of zinc is an 

 unsafe material to use with lime-sulphur in spraying apple or- 

 chards. 



ADDITIONAL DATA REGARDING SOEUBEE SUEPHUR COMPOUND. 



In a letter addressed to the Director of this Station under the 

 date of October i8 the General Manager of the Niagara Spray- 

 er Company stated that he was very much surprised to learn 

 that we had very unsatisfactory results with their Soluble Sul- 

 phur Compound, as the general results they were receiving 

 from all over the United States were very favorable. He ad- 

 mitted that in the New England States more burning had been 

 experienced than in other sections and attributed this to the 

 peculiar climatic conditions of the season, but they were con- 

 vinced that with one pound to 50 gallons of water with 21-2 

 pounds of arsenate of lead the results would be satisfactory. 

 In their printed directions supplied to us at the beginning of 

 the season it was recommended that i 1-2 to 2 pounds of the 

 material be used to 50 gallons, with no reference to arsenate 

 of lead. In the experiments already described 2 pounds of 

 Soluble Sulphur and one pound of dry arsenate of lead (ap- 

 proximately equivalent to 2 pounds of the paste form) were 

 used. 



Since our own report on the results obtained with this com- 

 pound upon apple foliage must be an adverse one it seemed only 

 just that an effort be made to determine whether or not this 

 agreed with the experience of other users of the Soluble Sul- 

 phur Compound in Maine during 1913. Accordingly a circular 

 letter was at once prepared, asking for information on this 

 point, and sent to some over 100 orchardists in various parts of 

 the State, mostly members of the Maine Pomological Society. 

 Many oi the replies received indicated that the general impres- 

 sion among the apple growers is that Soluble Sulphur Com- 

 pound is simply a lime-stdphur concentrate with all of the water 

 removed. Attention should be called to the fact that this is not 

 the case and the Niagara Sprayer Company have never made 

 such a claim in any of the literature which the writer has seen. 

 In justice it should also be mentioned that nothing which is 

 said here regarding the Soluble Sulphur Compound in any way 



