122 SHADE TREES. 



uct used in the proportion of 1 gallon to 10 gallons of water 

 is very satisfactory, but cannot be used on foliage. For 

 trees in leaf a mixture of 1 gallon in 30 gallons of water is 

 as strong as is safe. This mixture can be made at home 

 according to the formula given in our State and government 

 publications, but most people find it more satisfactory to use 

 the commercial product. 



Ammonia-coppcr-carbonate mixtu re. 



Copper carbonate oz. 



Ammonia (26 Beaume) 3 pts. 



Water 50 gal. 



Dissolve the copper carbonate in the ammonia and dilute 

 with water. This mixture has the advantage of not dis- 

 coloring the foliage. It is rather unreliable and should be 

 used with care and always tested on a single plant, or small 

 part of a plant, before general application. 



Potassium sulphide. 



Potassium sulphide (liver of sulfur), % to 1% Ibs. 

 Water 50 gal. 



This treatment is very successful on the surface-growing 

 fungi, such as the mildews, but of no value 011 the more 

 vigorous parasites. 



Sprayers. 



Spraying pumps and machines are easily obtained of any 

 seed house. For information regarding forms and sizes see 

 page 88. 



