262 LANDSCAPE GARDENING. 



together with a large practical experience in the care of 

 nearly all species and varieties of ornamental trees, shrubs, 

 etc., he hopes will enable him to present the latest and best 

 methods of preventing serious loss from the above pests. 

 The reader is referred to the popular bulletins published 

 by the various experiment-stations often giving illus- 

 trations of destructive insect or fungous pests with full 

 treatment for their destruction. If one finds a pest at work 

 and is not familiar with it, specimens should be sent at once 

 to the entomologist or botanist of the station for identifi- 

 cation and advice as to remedies. 



Insecticides. 



(Insect-destroyers. ) 



Practically there are but very few of the common insecti- 

 cides needed or of much value in the preservation of farm, 

 garden, or ornamental crops, and these are Paris green, 

 hellebore, kerosene emulsion, whale-oil soap, andpyrethrum- 

 powder. The first and second are used for the destruction 

 of chewing insects and the third and fourth for sucking 

 insects. 



PARTS GREEN. This is a chemical combination of 

 arsenic or arsenious acid and copper, technically called 

 arsenite of copper, which is used largely for making paint; 

 the arsenic or arsenions acid being the element that kills 

 insect life. It is a deadly poison and should be used with 

 extreme caution and never be applied in large quantities to 

 crops used as food or be kept in such places as to be accessi- 

 ble to irresponsible persons or children. 



Pure Paris green contains but a small percent of soluble 

 arsenions acid and can be used upon most plants without 



