Methods of Control 399 



Emulsions 



Kerosene Emulsion, The formula for kerosene 

 emulsion is as follows: 



Dissolve the soap in the water by heating. Re- 

 move the soapy water from the fire and add the kero- 

 sene and the liquid, violently mixing until a stable 

 milky emulsion is formed. This emulsion should 

 afterwards be mixed with water without the kero- 

 sene separating from it. As a spray for soft-bodied 

 sucking insects, the above stock solution should be 

 diluted ten to twenty times. Kerosene emulsion is 

 not extensively used in greenhouses. 



Linseed Oil Emulsion, Linseed oil emulsion has 

 been recommended by Vinal"^ for red spider on green- 

 house cucumbers. The emulsion according to Vinal 

 is made as follows: 



(a) The necessary articles for preparation are: 



1. Bucket pump. 



2. Container or mixing tank. This should hold 

 at least eight or nine gallons. For this purpose a 

 small washtub is perhaps the most available. Pails 

 may be used, provided the materials are mixed pro- 

 portionally. 



3. Ivory soap. 



4. Raw linseed oil. 



5. Hot water. 



♦Vinal, 8. C, Mass. Agr. Expt. Sta., Bui. 179: 175-176, 1917. 



Kerosene . 



Water 



Hard soap 



2 gallons 

 I gallon 

 ^ pound 



