E-36 UNITED STATES DEPARTMENT OF AGRICULTURE. 



BUREAU OF ENTOMOLOGY, 

 WASHINGTON, O. C. 



FOREST ENTOMOLOGY 3 



March 3, 1916. 



Brief Inf ormat ion on 

 KEROSENE EMULSION 

 Its Preparation and Use. 



Materials and Amounts for Stock Mixture. 



(a) Kerosene 2 gallons 



(b) Laundry or fish oil soap 1/2 pound 



(c) Wat8r 1 gallon 



Preparation. 



(1) Dissolve the soap in boiling water. 



(2) Remove the solution from fire, promptly add the kerosene and 



thoroughly agitate the mixture for about 5 minutes until 

 it becomes creamy - an emulsion. Where a pump is used the 

 agitation is most effectively done by pumping the mixture 

 through the nozzle back into the original container for 

 several minutes. , 

 Note. To avoid boiling, a naphtha soap may be used, but the 

 quantity of soap must be doubled and the water must be 

 so&'fc (rain water) . 



Dilution. 



To each two gallons of water add emulsion: 

 In Fall and Winter - 1 gallon. 

 In Summer - 1/3 gallon. 



Application. 



Aim %o cover every insect. 



Use any spraying device at hand: a tin atomizer is not too crude 

 for small plants and power sprayers with fine nozzles are 

 a necessity for extensive operations. Potash soaps and 

 warm solutions, well strained, prevent clogging of nozzles. 



For Spraying Trees Against Borers 



There is some evidence that the addition of sodium arsenate to 

 the solution, applied at the proper time, kills young 

 borers in the bark. It may, therefore, be well to try 

 it on a limited scale. Hence, in connection with the 

 above, dissolve one pound of sodium arsenate in the 2 

 gallons of water for the winter solution, and 10 ounces - 

 for the summer solution. 



A. D. HOPKINS, 



Forest Entomologist 



