96 



The Stock Solution. 



Laundry soap Yi pound 



Soft water (hot) 1 gallon 



Kerosene (coal oil) 2 gallons 



The Diluted Spray. 



Stock solution 1 gallon 



Water 9 to 12 gallons as required 



\Wiale-oil Soap or Fish-oil Soap is used for the same purposes as 

 kerosene emulsion. It may be employed against plant lice at the rate 

 of one pound dissolved in from four to six gallons of water. Its unpleasant 

 odour makes this insecticide less desirable for use on shade trees. 



Tobacco Extracts. — Several valuable preparations of nicotine 

 may be obtained from dealers in insecticides. "Black Leaf 40" is one 

 of the best of these, and is very effective in controlling plant lice. Soap 

 should always be added to the diluted spray at the rate of about one pound 

 to the barrel of forty gallons. 



Elm leaves curled by the Elm Woolly Aphis. (Original). 



