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remedies sufficiently caustic or penetrating in their 

 character to actually penetrate the body of the 

 insect until it reaches the vital organs and destroys 

 life in this manner. These materials must actually 

 be brought in contact with the insect to be de- 

 stroyed. Poisons would be of no value because the 

 insect's mouth parts are down deep in the tissues 

 of the plants entirely protected from materials of 

 this kind. Among the common remedies for this 

 class of insects might be mentioned kerosene emul- 

 sion, tobacco in various forms, soap solutions and 

 the homemade and commercial lime and sulphur. 



Kerosene emulsion is a remedy easily prepared at 

 home by boiling one-half pound of any common 

 soap in one gallon of soft water until dissolved, and 

 while still hot adding two gallons of kerosene or 

 coal oil (after removing from the fire). This mixture 

 is stirred vigorously for lO or 15 minutes, after 

 which the material takes on a milky appearance and 

 the oil remains in permanent suspension in the 

 water. When kerosene emulsion is used on plants 

 that are dormant, one gallon of the above stock 

 solution should be used to from 8 to 12 gal- 

 lons of water. When used on plants during the 

 growing period it should be used at the rate of one 

 gallon to IS to 20 gallons of water. 



Tobacco is a specific remedy for all forms of 

 plant lice, both indoors and out. In the greenhouse 

 and hotbed, where smoke can be confined, it is 

 usually used in this form. Small quantities of 

 leaves, stems or dust are burned at frequent inter- 

 vals throughout the inclosure and the smoke con- 

 fined. It is important that the fires are not allowed 

 to become too large and hot, and better results will 

 be secured if the stems and leaves are moistened 



