228 SECOND THOUSAND QUESTIONS IN AGRICULTURE 



Copper Sulphate. 



Copper sulphate 1 pound 



Water 15 gallons 



For use on dormant trees or for disinfecting seeds copper sulphate 

 without lime may be employed. The stock may be mixed as for Bordeaux. 

 On growing plants it may be used with a reasonable degree of safety at the 

 rate of one pound to 100 gallons of water. 



Corrosive Sublimate. 



Corrosive sublimate 2 ounces 



Water 15 gallons 



Corrosive sublimate or bichloride of mercury, one of the deadliest of 

 poisons to animal life, is a very effective disinfectant and fungicide. It is 

 one of the best preventives of potato scab. This is one of the solutions 

 used after pruning for antiseptic dressing of wounds of trees affected with 

 blight. It should be made and kept in wooden or earthen vessels. 



Formalin. 



Formaldehyde vapor dissolved in water in what is usually called the 

 40 per cent solution is one of the best fungicides and is often used in place 

 of corrosive sublimate. It is also used for treating seed potatoes, oats 

 and wheat. It should be employed in strength of 



FormaHn 1 ounce 



Water 2 gallons 



Flowers of Sulphur. 



Flowers of sulphur (use high-grade) is effective on surface mildews 

 when dusted over the plant when leaves are moist. Sulphuric acid 1-1000 

 has also proven successful on rose mildew and similar fungi. Likewise 

 milled sulphur. 



Self-Boiled Lime-Sulphur. 



Flowers of sulphur 8 pounds 



Lump lime 8 pounds 



Cold water 50 gallons 



Place the lime and sulphur together in a barrel and add just enough 

 cold water to slake the lime, stirring constantly to prevent burning. Keep 

 a piece of old carpet or burlap sack over the top of the barrel to retain all 

 the heat possible. Watch the mixture carefully and as soon as an orange 

 colored liquid starts to gather on the surface add the rest of the water. 

 Strain through a fine sieve to remove the particles of lime, but work all 

 the sulphur through. 



Do not use hot water or allow the mixture to stand after the lime is 

 slaked and before dilution. In this spray we do not want the soluble 

 sulphides (orange colored) to form, for these will injure the foliage and 

 fruit. 



