INSECTICIDES 



19 



Dissolve the lye in the water, heat to boiling, and 

 then add the oil. It should be boiled about two 

 hours, and when done water can be added to make up 

 for the loss by evaporation. For use as an insecticide 

 it is made into a dilute suds by dissolving i pound of 

 soap in 8 gallons of water. It is less liable to injure 

 foliage than kerosene emulsion. 



Lime Spray is made by slaking a half -peck or a 

 peck of fresh lime in water, and pouring into a barrel 

 nearly full of water, straining the lumps out as it 

 enters the barrel. By means of this and the spray 

 pump, trees and vines may be literally whitewashed. 

 It is useful in mechanically coating plants so that 

 flea-beetles, and perhaps other insects, will not 

 molest them. 



Tobacco Decoction — This is made by boiling 

 refuse tobacco stems or dust in water, or pouring 

 boiling water over them. This gives a concentrated 

 liquid, which is to be diluted with cold water, until 

 there are two gallons of water for each pound of 

 tobacco used. It is a good remedy for plant-lice. 

 A stronger formula, recommended by Professor M. V. 

 Slingerland, is to steep 5 pounds of tobacco stems in 

 3 gallons of water for 3 hours ; then strain and dilute 

 with enough water to make 7 gallons, when the 

 decoction is ready to use. 



Whale-oil S oap— Dissolve in water at the rate of 

 2 ounces soap to i gallon water. This is good to 

 destroy plant-lice, rose slugs, etc. Good's potash soap 

 No 3 seems to be the best whale-oil soap for insec- 

 ticidal purposes. 



FUNGICIDES USED IN SPRAYING 



The principal fungicides used in spraying are 

 certain salts of copper, especially the sulphate of 

 copper and the carbonate of copper. These substances 



