12 CIRCULAR 175, TJ. S. DEPARTMENT OF AGRICULTURE 



west unless soft water is available. The niiscible oil mixes very well 

 with most hard waters. The boiled emulsion and casemate emulsion 

 may be made very easily, but the manufacture of miscible oil should 

 not be attempted by the grower unless a cresol-soap emulsifier can 

 be obtained. Satisfactory miscible oils and oil emulsions are on the 

 market which may be used in place of the homemade materials, and 

 in most cases these will be safer and more economical. 



The addition of casein spreader to the diluted casemate emulsion 

 apparently neither increases nor decreases its effectiveness against the 

 San Jose scale. 



The addition of weak lime sulphur to the caseinate emulsion in- 

 creases its toxicity, a complete mortality resulting from a 2 or 3 per 

 cent oil emulsion to which this has been added. This combination 

 should be used only on dormant trees, as it is very likely to burn the 

 foliage. An oil emulsion containing coconut fatty acid is also evi- j 

 dently more toxic than one without. 



U. S. GOVERNMENT PRINTING OFFICE: 1931 



For sale by the Superintendent of Documents, Washington, D. C. Price 5 cents 



