INSECTICIDES, FUNGICIDES AND DISINFECTANTS 217 



depending upon the liability of the plant to lime-sulphur 

 injury. 



Self-boiled lime-sulphur is prepared from quick-lime (CaO) 

 and sulphur flour. The sulphur is put in suspension through 

 the agency of the slaking lime, very little chemical union of 

 lime and sulphur probably occurring. The usual proportions 



FIG. 73. Barrel spray pump with hose and bamboo extension rods 

 for orchard spraying. (Farmers' Bulletin 243, U. S. Dept. Agr.) 



are 8 pounds of lime and 8 pounds of sulphur in 50 gallons 

 of water. The process is carried out to best advantage 

 when four times the above quantities are used. This spray 

 is especially adapted to use on tender-foliaged plants. 



Finely divided sulphur in suspension is largely replacing 

 self-boiled lime-sulphur and ordinary lime-sulphur. Several 

 proprietary preparations of this nature are on the market. 



