FUNGICIDES 



27 



solving 5 ounces carbonate of copper in 3 pints of 

 ammonia and then adding to a barrel (50 gal- 

 lons) of water. To prevent loss from evaporation of 

 ammonia, the dissolved carbonate should be added to 

 the water immediately before spraying. It is a simple 

 fungicide, easy to make and apply, and as it is a 

 clear solution, there is no trouble w^th its clogging 

 nozzles. It has been successfully used to prevent apple 

 scab and various mildews. 



A combination of carbonate of copper and car- 

 bonate of ammonia recommended by Professor F. D. 

 Chester as superior to the above, is made as follows : 

 ''Mix together 3 ounces carbonate of copper and i 

 pound pulverized carbonate of ammonia. Dissolve this 

 mixture in 2 quarts hot water and add to 50 gallons 

 water." A barrel of this mixture costs 12 cents. 



Professor Chester also reports good results from 

 copper carbonate prepared as follows : "Thoroughly 

 mix in half a pail of w^ater, i pound of carbonate of 

 copper, to w^hich is added 3 ounces of common glue 

 dissolved in hot water, then dilute to 25 gallons." It 

 would probably be better to dilute to 50 gallons. 



Sulphate of Copper — Besides its use in combina- 

 tion with other substances, copper sulphate is often 

 applied to dormant vines and trees early in spring tc 

 destroy the winter spores of fungi. For this purpose 

 it is used in a simple solution made by dissolving 2 

 pounds copper sulphate in 50 gallons water. 



Extremely dilute solutions — one part of copper 

 sulphate to 1000 parts of water — have been used to 

 advantage in greenhouses to check such diseases as 

 carnation rust. 



Potassium Sulphide — Dissolve ounce of potas- 

 sium sulphide (liver of sulphur) in i gallon of hot 

 w^ater. When cold apply in a spray. Used to prevent 

 gooseberry mildew and similar diseases. 



