EXPERIMENTAL SPRAYING AT HIGH MOOR FARM. 95 



apparatus. It is also of advantage in orchards which are re- 

 mote from an adequate water supply. 



Proprietary spraying compounds: Under this heading only 

 those spraying materials are considered which have been tried in 

 comparison with lime-sulphur and bordeaux mixture — the com- 

 mercial brands of lime-sulphur concentrates are not discussed. 



The first material of this kind employed was what is known 

 to the trade as "Sulfocide" and was used by Mr. Bonns in 

 1910. For the first two applications one-third gallon was used 

 to 50 gallons of water with two pounds of arsenate of lead 

 paste added. For the third and last application the amount oE 

 "Sulfocide" was decreased to three-sixteenths gallon and the 

 amount of arsenate of lead paste increased to 3 pounds. 



Very serious injury followed its use. Leaf scorching of the 

 most severe type followed shortly after the second application. 

 This injury was increased by the final application although the 

 amount used was a greater dilution than the weakest strength 

 recommended by the manufacturers. The fruit was also in- 

 jured severely, particularly around the calyx. As a result 

 nearly 45 per cent of the apples at harvest time were found to 

 be so badly deformed and injured as to render them unsalable. 

 '"Sulfocide" proved very efficient in scab control, but on ac- 

 count of the injury mentioned the amount of merchantable 

 apple secured with it was far less than where no spray at ill 

 was applied. 



A dry powder to be applied after dissolving and diluting 

 with water and known under the trade name of "Soluble sul- 

 phur" was used in 1913 and 1914. This has been much adver- 

 tised and sold in Maine as a substitute for lime-sulphur. The 

 manufacturers did not make such claims but many orchar discs 

 purchased and used the material supposing that it was identical 

 in composition with lime-sulphur, except that the water in the 

 liquid had been removed. 



The first year at Highmoor two pounds of this powder and 

 one pound of dry arsenate of lead was used in 50 gallons of 

 water. Efficient scab control was secured but the effects on 

 the foliage were disastrous. Shortly after the second applica- 

 tion of the spray very evident leaf injury began to appear in 

 the form of spotting and more or less browning of the margins. 

 This injury developed slowly till after the third application on 



