SPRAYING 261 



FUNGICIDES 



Bordeaux mixture Sulfur. 



Copper sulfate. Potassium sulfide. 



Ammoniacal copper carbonate. Formalin. 

 Lime-sulfur. Corrosive sublimate 



INSECTICIDES 

 Poisons Contact Remedies 



Paris green. Lime-sulfur 



Arsenite of soda. Sulfur 



Arsenite of lime. Whale-oil soap. 



Arsenate of lead Kerosene emulsion. 



Hellebore Crude petroleum 



Soluble oils 

 Carbolic acid. 

 Hydrocyanic acid gas. 

 Carbon bisulfide. 

 Tobacco. 



It will be seen that, in general, one material is not of 

 much value for both insects and fungi. Lime-sulfur 

 is a good fungicide and contact insecticide. In some other 

 cases the same remedy does good for both insects and 

 fungi. Bordeaux mixture repels the flea-beetle on potatoes, 

 and the striped cucumber- and melon-beetle, so that it is 

 of some value against these insects; and Paris green is 

 of some value as a fungicide; but generally we must not 

 expect one remedy to be of value against more than one 

 of the three classes of enemies. Many of the supposed 

 failures in spraying are due to the use of the wrong remedy. 



237. Spraying for Fungi. The standard remedy for 

 fungous diseases is Bordeaux mixture. This is made of 

 copper sulfate and lime. It is the copper suifate that 

 kills the fungi. But if it is used alone it will also injure the 

 foliage. The lime prevents most of this injury. As we 



