282 Elementary Principles of Agriculture 



Paris Green is a standard poison for all insects that 

 bite and swallow their food. It is heavy and, therefore, 

 requires constant agitation to keep suspended in the 

 spraying preparation. Paris Green is used at rate of 

 about four ounces to fifty gallons of water. It is advisable 

 to add some lime to the mixture to prevent injury to 

 the foliage. It should be first worked into a paste 

 before adding to a large quantity of water, whether 

 used singly or in combination with Bordeaux Mixture. 



Arsenate of Lead. This is often preferred to Paris 

 green because it is lighter, remains in suspension longer, 

 and adheres to the foliage better. It is white in color 

 and can be readily seen. Another important advantage 

 claimed for Arsenate of Lead is that it is less liable to 

 injure tender foliage. In its preparation use: 



Arsenate of soda 4 ounces 



Acetate of lead 11 



Water 16 gallons 



Dissolve the first two separately in a small amount of 

 water and then mix and add the full quantity of water. It 

 may be purchased, prepared ready for use, at seed stores. 



Dust Applications of Insecticides are sometimes 

 advisable. Special machines are on the market for 

 applying both insecticides and fungicides in the form 

 of dust. Dust applications have not been found so uni- 

 formly satisfactory as the liquid applications. 



Spraying Domestic Animals with poisons is some- 

 times recommended to kill insects, ticks and other 

 parasites. Various preparations of oils and arsenical 

 preparations are used. London Purple, dusted on the 

 perches, nest and bodies of poultry, is a very satisfactory 

 way to destroy mites on poultry. If applied regularly, 

 it becomes a preventive. 



