


New York AGRICULTURAL EXPERIMENT STATION. 157 
From this trial it does not appear that the potassium sulphide 
was decidedly more effectual than the soda hyposulphite, although 
as applied it contained about fifteen times as much sulphur. The 
soda hyposulphite as applied injured the foliage somewhat, and 
evidently could not be safely used in a stronger solution. 
The calcium sulphide* apparently did no good whatever. This 
substance is only very sparingly soluble in cold water, which may 
account for its inaction. The fact that the sprayed part, when 
treated with this substance, showed so much greater percentage 
of injury than the unsprayed, throws a possible doubt over the 
whole trial, for we can not suppose that this compound of sulphur 
could have favored the growth of the fungus. 
CONCLUSIONS. 
The results of these tests appear to warrant the following 
conclusions : 
First. That soda hyposulphite and potassium sulphide as applied 
proved beneficial in preventing injury from the fungus. This 
conclusion is strengthened by the results secured in previous 
experiments already cited. 
Second. The tests do not prove that the greater amount of 
sulphur added in the potassium sulphide, as compared with the 
soda hyposulphite, rendered this substance the more effectual, 
though there are indications in this direction. 
Third. That calcium sulphide is of little or no value for the 
purpose used. 
Fourth. That while further experiments are needed to furnish 
data from which we may compute the actual benefits conferred by 
the treatments, the indications are that the good accomplished 
was sufficient to warrant the slight cost of the materialst in the 
ease of orchardists who spray their trees for the codling moth. 



* Calcium sulphide was also used for the gooseberry mildew, but without 
perceptible effect. 
7 These substances may be purchased at the drug stores, the soda hypo- 
sulphite at six to ten cents per pound and the potassium sulphide at 
twenty-five to sixty cents per pound, according to the quantity and place 
of purchase. The former is readily soluble in cold water, the latter is 
better dissolved in a small quantity of warm water and then added to the 
water used for spraying. | 
