DISEASES OF CULTIVATED PLANTS 665 



Caution. Plants likely to be injured by Bordeaux mixture are 

 susceptible to more severe injury from applications of ammoniacal 

 copper carbonate. This solution should therefore be applied to such 

 plants with caution, if at all. 



Eau Celeste (Modified) . The following formula is used for a 

 solution of eau celeste: 



Copper sulphate 4 pounds 



Ammonia 3 pints 



Sal soda 5 pounds 



Water to make 45 gallons 



Dissolve the copper sulphate in 10 or 12 gallons of water, add 

 the ammonia, and dilute to 45 gallons; then add sal soda and stir 

 until dissolved. Eau celeste is an effective dormant spray for the 

 peach leaf-curl and other similar diseases, but it is unsafe to use on 

 the foliage of most plants. (F. B. 243.) 



Caution. This wash should not be used on the foliage of stone 

 fruits, and should be applied to other growing plants only with due 

 caution. 



Sulphur and Resin Solution. The mixture known as sulphur 

 and resin (sar) solution is made up as follows: 



Sulphur (flowers or flour) 16 pounds 



Resin (finely powdered) % pound 



Caustic soda (powdered) 10 pounds 



Water to make 6 gallons 



Place the sulphur and resin, thoroughly mixed, in a barrel or 

 smaller vessel and make a thick paste by the addition of about 3 

 quarts of water. Then stir in the caustic soda. After several min- 

 utes the mass will boil violently, turning a reddish brown, and should 

 be stirred thoroughly. 



After boiling has ceased add about 2 gallons of water and pour 

 off the liquid into another vessel and add to it sufficient water to make 

 6 gallons. This form of stock solution may be used at the rate of 1 

 gallon to 50 of water for spraying most plants and for soaking seeds. 

 Potassium Sulphid. For a fungicide of potassium sulphid the 

 following formula may be used: 



Potassium sulphid (liver of sulphur) 1 ounce 



Water 3 gallons 



Dissolve the liver of sulphur in the required amount of water 

 and use immediately. On standing the mixture deteriorates rapidly. 

 It is effective for surface mildews, such as gooseberry mildew. 

 (F. B. 243.) 



Sulphur. This is used as a fungicide in a pure state. It is on 

 the market in a number of different commercial grades. The "flow- 

 ers" of sulphur is the lightest and usually the purest chemically. 

 The "flour" of sulphur, while finely divided, is not so light. It is 

 sold in different degrees of fineness and purity. Stick sulphur is tho 

 same material in a solid stick. Flowers of sulphur dusted on plants 

 is useful as a remedy for mildew, especially the rose mildew and tho 

 powderly grape mildew. 



