288 



SPRAYING MIXTURES 



should be added to prevent boiling over and to maintain 

 a thick liquid. When the mixture has boiled about an hour, 

 it should be of a dark amber color. It is then diluted to 

 50 gallons and applied to the trees while still hot. 



In making a small quantity of the spray, an iron kettle 

 may be used, but when larger quantities are desired, it is 



boiled by live steam 

 in a barrel or in a 

 large wooden tank. 



Concentrated Lime- 

 sulphur Solution. - 

 Growers that have 

 the facilities for cook- 

 ing lime and sulphur 

 frequently prefer to 

 make it in a con- 

 centrated form. This 

 may afterwards be 

 diluted in spraying 

 for the San Jose scale 

 or used as a summer spray for fungous diseases. This spray 

 is cooked in a similar manner and is afterwards strained 

 into an air-tight barrel, as exposure to air causes the sulphur 

 compounds to lose their value. Each lot should be tested 

 with the Baume hydrometer and diluted when used, 

 according to the dilution table. 

 Formula : 



Stone lime 75 Ib. 



Sulphur 150 Ib. 



Water 50 gal. 



Tobacco. -- There are various tobacco extracts now upon 

 the market used as contact sprays for plant lice and other 



Fig. 155. Making lime-sulphur spray. 



