l8o MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



comparison with plot 4. Plot 10 was also a continuation of the 

 work of previous years, the object being to determine whether 

 or not it is safe and profitable to add 20 per cent more of the 

 lime-sulphur concentrate to a given amount of water, thus in- 

 creasing the strength of the summer spray to that extent. 



In 1 91 3 a proprietary spraying material in powder form, 

 known under the trade name of "Soluble Sulphur," was used at 

 the rate of 2 pounds to 50 gallons of water in combination 

 with one pound of dry arsenate of lead. While this material 

 appeared to be quite effective in scab control that season very 

 serious leaf injury resulted. Correspondence with orchardists 

 in various parts of the State, who had used this material as a 

 summer spray, showed that in the majority of cases they had 

 experienced a like difficulty. Plot 6 was a repetition of the 

 previous trial of this material, but the amount used to 50 gallons 

 of water was reduced to three-fourths pound on the recom- 

 mendation of the New England selling agents of Soluble Sul- 

 phur. 



The "Atomic Sulphur" used on plot 7 is another proprietary 

 spray material which was used in 191 3. 



The "copper-lime-sulphur" applied to plot 8 was a combina- 

 tion of spray materials used for the first time at this Station. 

 Dr. Howard S. Reed and his associates at the Virginia Agri- 

 cultural Experiment Station reported very successful results 

 with this in their spraying experiments for cedar rust of apples 

 in 1913.* Since no unfavorable effects with reference to foliage 

 or fruit injury were recorded in their publication this spray 

 combination appeared promising as a means of combatting apple 

 scab. Therefore, it was included in the experimental series of 

 1914. 



Plot 9, sprayed with the extra fine sulphur, was introduced 

 at the request of a representative of the Union Sulphur Com- 

 pany of New York. This extra fine flour sulphur was prepared 

 for application as a liquid spray material as per directions fur- 

 nished by him as follows : 



"For every seven or eight pounds of dry sulphur to be used 

 prepare two gallons of glue solution containing one-half ounce 



*Reed, Howard S., Cooley, J. S., amd Crabill, C. H. Experiments on 

 the Control of Cedar Rust of Apples. Virginia Agl. Exp. Sta. Bui. 203, 

 1914- 



