mm 



yE -162. UNiTED STATES DEPARTMENT OF AGRICULTURE 



BUREAU OF ENTOMOLOGY. 

 WASHINGTON 



FOREST ENTOMOLOGY BRIEF 3. March 3, 1916* 



(Revised August 19, 1918.) 



' KEROSENE EMULSION 



Materials and Amounts for Stock Mixture. 



(a) Kerosene 2 gallons ^. 



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



(c) Water 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. 



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

 quantity of soap must be doubled and the water must be 

 soft (rain water) . 



Dilution. 



To each two gallons of water add emission: 

 In Fall and Winter -1 gallon. 

 In Summer - 1/3 gallon. 



Application. 



Aim to 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. 

 Note. Any of the standard brands of miscible oils cn the market may be used in 

 place of Kerosene Emulsion for spraying the bark of trees or shrubs. 

 Directions for use are on the containers and should be followed carefully. 



Poisoned Emulsion for Spraying Trees against Borers. 



A number of species of tree borers are killed while young by spraying the bark 

 at the proper time with the following preparation: 



In each gallon of water used for diluting Kerosene Emulsion or 

 miscible oil dissolve one ounce of sodium arsenate or sodium arsenite. 



A. D. HOPKINS, 



Forest Entomologist. 



