860 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



IV. The fungicidal action of ammoniacal copper carbonate is not so 

 great as that of Bordeaux mixture, but it has the advantage that it may 

 be used with impunity upon delicate foliage, such as that of peaches, 

 which Bordeaux mixture even in the diluted form would burn. It has 

 proved effective in dealing with the "shot-hole" fungus of peaches and 

 with peach "curl " (in the latter case combined with pruning). 



C. Potassium Sulphide Solution. 



Potassium sulphide (liver of sulphur) . . 1 oz. 

 Water . 3 gallons. 



Preparation. — The potassium sulphide readily dissolves in water, 

 but impurities are sometimes present which do not dissolve. Fresh 

 material should be used as the sulphide alters in contact with the air. 



Use. — The solution is useful against many mildews and other fungi, 

 and should be used as strong as the foliage will bear. The quantities 

 given above are safe for almost any foliage, but some will bear a stronger 

 solution. The solution discolours white paint. 



D. Self-boiled Lime-sulphur Spray. 



Flowers of sulphur 10 lb. 



Quicklime 15 lb. 



Water 50 gallons. 



Preparation. — The lime is placed in a wooden barrel, and two or three 

 gallons of boiling water poured over it. The sulphur is immediately 

 added, together with three gallons of hot water. Cover the vessel with 

 a cloth, and the mixture will boil by the heat of the slaking lime for 

 twenty minutes. Stir occasionally to prevent burning. When the 

 boiling ceases add enough water to make fifty gallons. Strain through 

 a sieve, with about twenty meshes to the inch, to take out the larger 

 particles of lime, but work all the sulphur through. 



Use. — This •solution has recently been used with excellent results in 

 America as a fungicide, and it is worthy of extended trial. Even peach 

 foliage is uninjured by it, and it has proved useful in checking various 

 fungus diseases of apples, including scab and leaf-spot.* 



* See U.S.A. Dep. Agr., Circ. 1 ; April 1908. 



