SPRAYING 85 



phur should be carefully worked through the 

 strainer. 



In using arsenate of lead with this mixture it 

 should be added at the rate of 2 pounds to 50 

 gallons. 



SOLUBLE OILS 



There are now on the market several brands of 

 so-called soluble or miscible oils, which are exten- 

 sively used in the campaign against the San Jos6 

 scale. These are simply various products of the 

 kerosene industry made up in such a manner that 

 they mix readily with water. The usual way of 

 applying these oils is to add one gallon of oil to 15 

 or 16 gallons of water, stirring the solution vigor- 

 ously, usually by pumping it back into the barrel. The 

 solution is then ready for immediate use. It is this 

 ease of mixing and applying which forms one of the 

 strong recommendations for this kind of spray. It 

 gives excellent success in many instances. 



KEROSENE EMULSION 



For combating aphis and certain other sucking 

 insects kerosene emulsion is always recommended, 

 sometimes used and in rare instances proves effec- 

 tive. It is made up as follows : 



Hard soap, shaved fine, J4 pound 

 Water, i gallon 



Kerosene, 2 gallons 



Dissolve the soap in the water, which should be 

 boiling; remove from the fire and pour it into the 

 kerosene while hot. Churn this with a spray pump 

 till it changes to a creamy, then to a soft butter-like 



