106 



854. SALT— Common. 



A strong solution is sometimes used as a spray; more often applied 

 in crystal to the ground as a preventive dressing. 



855. SALTPETER. 



Used the same as salt. 



856. SULPHATE OF IRON. 



Occasionally used in solution as a spray. A common ingredient of 

 proprietary insecticides. Very injurious to foliage. 



857. SULPHATE OF COPPER. 



See Bordeaux mixture. 



858. SULPHIDE OF POTASSIUM. 



Is dissolved in water and used as a spray. 



859. SULPHUR POWDER. 

 Sifted or blown onto plants. The smoke is also used as a fumigant. 



860. SULPHO CARBONATE OF POTASSIUM. 



Applied in holes or trenches to destroy root-feeding insects like the 

 grape Phylloxera. 



861. SULPHUR AND LIME WASH. 



Sulphur pounds . . 33 



Lime do 4:2 



Salt < do.... 25 



Water to make gallons.. 100 



Boil the sulphur and one-half the lime in 33 gallons of water. Mix 

 the salt and remaining one-half the lime and slack the mixture. Add 

 this to the lime-sulphur solution and dilute with water to 100 gallons. 

 Used as spray for scale insects, but not so good as the resin washes. 



862. TAR. 



Domestic animals are washed in a strong solution to repel insect 

 pests. Also sprayed on plants. Tarred bands, etc., are used to stop 

 progress of chinch bug, army worm, etc. 



863. TOBACCO DUST. 



Powder made from tobacco stems and waste from cigar factories is 

 dusted on plants and around their base as a repellant. 



864. TOBACCO DECOCTION. 



This is made as strong as possible as a wash or spray to kill insect 

 pests on animals or plants. 



