Fungicides, jor Plaiit- Diseases. 43 



Potassium sulptiide.— Used at the rate ot }4 or X ounce to the 

 gallon of water. For various mildews, as gooseberry mildew. 



Skawinski's powder.— Mix 22 pounds of finely powdered sulphate 

 of copper with 33 pounds of soot or alluvial earth and 165 

 pounds of coal-dust. For treatment of mildews. 



Skawinski's sulphate of iron and sulphuric acid solution. — Sul- 

 phate of iron, 110 pounds; sulphuric acid (53 degrees), 1}4 

 pints ; warm water, 22 gallons. Pour sulphuric acid on the 

 crystals of iron, then add the water. Use while warm. 



Soda hyposulphite. — 1. Half-ounce to 10 gallons of water. For 

 various diseases. Little used now. 



2. 1 pound in 10 to 20 gallons of water. For celery leaf- 

 blight, orange leaf-blight, apple-scab. Should be used as 

 as soon prepared. Little used. 



Sulfo-steatite or Cupric steatite. — An exceedingly fine bluish 

 powder composed of steatite, or talc, and about 10 per cent, 

 of sulphate of copper. Considered the most adherent of aU 

 fungicide powders. For mildews. 



Sulphate of copper. — 1. Dissolve }4 pound of pure sulphate of 

 copper in 5 to 12 gallons of water. For treatment of downy 

 mildew and black-rot of gi-ape and apple-scab in ^vinter, or 

 in spring before the buds swell. 



2. Dissolve 5 to 8 pounds in 10 gallons of water. For soak- 

 ing grains previous to sowing, to destroy spores of smuts. 

 The Germans use a 3^-per-cent. solution, and soak the grains 

 for about 16 hours. 



Sulphate of iron.— 1. Simple solution in water of 4 to 8 pounds to 

 the gallon. To be used only as a wash before the buds swell. 

 For anthracnose of the vine and raspberry, etc. 

 2. For a spray, dissolve about 1}^ pounds to the gallon. 



Sulphatine, the Esteve process. — Mix 2 pounds of anhydrous sul- 

 phate of copper with 20 pounds of flowers of sulphur and 2 

 pounds of air-slaked lime. For mildew, downy mildew and 

 black-rot of gTape, tomato and potato-blight and rot. 



Sulphide, or sulphuret, of potassium (Liver of sitJp?iur).— Simple 

 solution in water of }{ to 1 ounce to the gallon. For mildew 

 in greenhouses, mildew on roses, erinose of vine, orange 

 leaf-scab, celery leaf-blight, pear and apple-scab and various 

 rots. 

 Sulphide of soda wash {Hilgard's) . — Dissolve 30 pounds of whale- 

 oil soap in 60 gallons of water by heating the two together 



