USEFUL FUNGICIDES 631 



Occasionally sulphur is mixed with water, the solution being 

 applied by a syringe. In glass-houses, sulphur-paste is sometimes 

 painted on the hot water pipes to create sulphurous fumes. 



Ammoniacal copper fungicide. This is a useful fungicide, 

 which has properties similar to those of Bordeaux mixture. It is 

 prepared as follows : 



Copper Milphate (98 pei cent) 1 uz. Ammonia solutio i (strongest) 12 fl. ox.. 

 Carbonate of soda (98 per cent.) 1| oz. Water to make 12 gallons 



Dissolve the copper sulphate and soda separately, each in 

 half a gallon of water, pour the soda into the copper solution and 

 stir well. When the precipitate has settled, pour off the clear 

 liquid ; give the precipitate a second washing, and when again 

 settled pour off the supernatant clear liquid. Then introduce 

 sufficient liquid ammonia to the precipitated copper carbonate to 

 dissolve it, care being taken not to use any unnecessary excess of 

 ammonia. To this add water to make up to 10 gallons, when the 

 liquid is ready for use. This preparation is specially recommended 

 for surface moulds and for the Rose mildew. 



Potassium sulphide. This powerful and useful fungicide 

 must be kept in well-corked bottles or air-tight vessels, as it 

 rapidly decomposes when exposed to the air. Care must be taken 

 to adjust the strength of the solution to the nature and hardiness 

 of the plants under treatment ; a quarter of an ounce to one 

 gallon of water will generally answer for slight attacks, and from 

 4 oz. to 6 oz. in 10 gallons of water is considered strong enough 

 to suit all requirements. 



Potassium permanganate. (Permanganate of potash). A 

 simple but effectual fungicide may be prepared by dissolving about 

 30 to 40 grains of permanganate of potash in a gallon of water. 

 The solution resembles Condy's fluid, being of a pale claret colour, 

 and may be used for herbaceous and bulbous plants with good 

 effect. 



Condy's Fluid, Jeye's Fluid, etc. These are useful fungi- 

 cides, and are sometimes employed for sterilising soil, the latter 

 being allowed to remain a week after treatment before anything is 

 planted or sown. The proportions should be about 1 oz. of the 

 fluid to 1 gallon of water. 



Corrosive sublimate. For disinfecting seed, preserving 

 books, dried specimens of plants, etc., nothing is better than a 

 solution of corrosive sublimate. This is a powerful poison and 

 kills bacteria, fungus spores and similar organisms by contact. 



