INJURIOUS INSECTS. 



87 



without spoiling. Tobacco is an excellent fertilizer as well as 

 insecticide. 



Kerosene emulsion is a valuable insecticide. It kills by con- 

 tact and is of greatest importance for destroying sucking insects 

 such as lice, scale insects and soft caterpillars, but also kills 

 many biting insects. It is made as follows: 



Kerosene oil, 2 gallons, 67 per cent; common soap, or whale 

 oil soap; pound, 33 per cent. 



Two pounds of soft soap may be used in place of the soap 

 recommended. 



Dissolve the soap over a brisk fire, remove and add the kero- 

 sene while the water is hot. Churn the mixture or stir rapidly 

 until a creamlike emulsion is secured. If well made the kero- 

 sene will not separate but on cooling the emulsion will thicken 

 into a jelly-like paste that adheres without oiliness to the sur- 

 face of glass. Soft water will give far better results than hard 

 water for making kerosene emulsion, and soap that is made with 

 potash or soda lye, such as home made soap, is far better than 

 most of the soap of the stores, as they do not emulsify easily. 

 For plant lice, dilute the emulsion recommended vnth from 

 twenty to twenty-five parts of cold water. The strength of the 

 application will necessarily depend on the insects to which it is 

 to be applied. For such insects as soft-skinned caterpillars the 

 emulsion should be diluted with not more than ten parts of 

 water. 



Kerosene and milk emulsion may be used as follows: 



These readily form an emulsion when thoroughly churned 

 together. It should be used the same as other soap and kerosene 

 emulsion mentioned. Sweet milk does not emulsify readily but 

 if a little sour or even if yevy sour, it unites easily with the kero- 

 sene. This is the best emulsion where the water is very hard. 



Carbon bisulphide is a very inflammable material with a 

 disagreeble odor and readily vaporizes. It should be handled 

 with the same precaution as gasoline which resembles it in 

 appearance. The fumes which it gives off are very heavy and 

 are poisonous to animal life when confined with it. On account 

 of these properties it is used for killing weevils in grain or peas, 



Kerosene 

 Sour milk 



2 gallons. 

 .1 gallon. 



