110 ENEMIES OF THE ORCHARD 



The three substances above described are poison- 

 ous to animals as well as insects, while those which 

 follow are poisonous to insects alone: 



Kerosene Emulsion. This is made by dissolv- 

 ing y pound of good hard soap or i quart of 

 soft soap in 2 quarts of hot water; add i pint 

 of kerosene and mix thoroughly. This is some- 

 times done by churning. A better way is to 

 make it with a force pump, pumping it 

 through and returning it to the vessel several 

 times. When thoroughly mixed it may be set 

 away for any length of time, and when needed 

 dilute the mixture with three times its measure 

 of water. 



Pyrethrum (BuhacJi) is used successfully for plant 

 lice or red spiders. It may be applied direct in a 

 powder, or dissolved in alcohol. Use 4 ounces of 

 alcohol to i of pyrethrum in a bottle kept tightly 

 corked. Shake occasionally, and at the end of a 

 week filter through fine muslin and apply with an 

 atomizer. 



Quassia Chips, boiled to a strong solution, will 

 kill plant lice but does not injure the spiders. Use 

 2 ounces of chips to 2 quarts of water. A few 

 hours after the application of any of these prepara- 

 tions upon house plants, they should be thoroughly 

 washed in clean water. 



Neither of the three last-named are poisonous to 

 animals and kill the insect only by contact, so it 

 will be necessary to know that the work is done 

 thoroughly. 



