264 LANDSCAPE GARDENING. 



Paris green alone can be safely used only at the rate of 

 1 Ib. to 250 or 300 gals, of water, This, however, is a very 

 small quantity, and to enable more Paris green to be used 

 lime is added to neutralize the soluble arsenious acid. Two 

 Ibs. of lime slaked in water and added to 25 gals, of water 

 will enable us to use as much as 1 Ib. of Paris green to 

 100 and even 50 gals, of water without injury to the 

 foliage. When the Bordeaux mixture (see "Fungicides 55 ) 

 is used, the lime in that mixture has the same effect, and 

 1 Ib. of Paris green to 50 or 100 gallons of the mixture may 

 be used without injury to the foliage (except upon the 

 peach and cherry trees), and the work of destroying insects 

 and fungi thus reduced one half. 



HELLEBORE-POWDER. This is a fine powder made from 

 grinding the roots of Veratrum album, and will kill most 

 chewing insects. It, however, is more expensive and does 

 not adhere so well to the foliage as Paris green, even if 

 used in lime or water. Ib will not, however, injure the 

 foliage, and is not nearly so poisonous not dangerously so 

 unless taken into the lungs or stomach in large quantities. 

 It is best used in water or while the foliage is wet with rain 

 or dew. 



KEROSENE EMULSION. Formula: -J Ib. common bar 

 soap, 2 gallons water, 2 gallons common kerosene. 



Dissolve the soap in the hot water; while still hot, add 

 the kerosene and churn back and forth with a ga^den- 

 pump or syringe until a soft soap or cream-like substance 

 is formed. When cold, dilute with water to make from 10 

 to 25 gals, of liquid. This is used for the destruction 

 of sucking insects like aphides (plant-lice), scale insects, 

 etc. 



WHALE-OIL SOAP is very frequently used as an insecti- 



