CONDENSED INFORMATION CONCERNING SOME OF THE MORE 

 VALUABLE INSECTICIDES. 



KEROSENE EMULSION. 



This insecticide acts by contact and is applicable to all non-mastica- 

 ting insects (sucking insects, such as the true bugs and especially 

 plant lice and scale insects) and also to many of the mandibulate in- 

 sects when the use of arsenites is not advisable. Kerosene emulsion 

 may be made by means of various emulsifying agents, but the most 

 satisfactory substances and those most available to the average 

 farmer and fruit-grower are milk and soapsuds. In each of these 

 cases the amount of emulsifying agent should be one-half the quan- 

 tity of kerosene. 



One of the most satisfactory formulas is as follows : 



Per cent. 



Kerosene gallons. . 2 67 



Common soap or whale-oil soap pound. . J"\ 



Water gallon.. 1/ 33 



Heat the solution of soap and add it boiling hot to the kerosene. 

 Churn the mixture by means of a force pump and spray nozzle for 5 or 

 10 minutes. The emulsion, if perfect, forms a cream which thickens 

 upon cooling and should adhere without oiliness to the surface of 

 glass. For use against scale-insects dilute one part of the emulsion 

 with nine parts of cold water. For most other insects dilute one part 

 of the emulsion with fifteen parts of water. For soft insects, like 

 plant lice, the dilution may be carried to from 20 to 25 parts of water. 



The milk emulsion is produced by the same methods as the above. 



THE RESIN WASHES. 



These insecticides act by contact, and also, in the case of scale- 

 insects, by forming an impervious coating which effectually smothers 

 the insects treated. These resin washes vary in efficacy according 

 to the insect treated. Experience has shown that the best formula 

 for the Red Scale (Aonidia aurantii Maskell) and its yellow variety 

 (A. citrinus Coquillett) is as follows: 



Resin pounds. . 18 



Caustic soda (70 per cent strength) do ... . 5 



Fish oil pints. . 2i 



Water to make gallons. . 100 



(3) 



