144 The Canadian Horticulturist. 



To give our readers some idea of the true value of the chemicals required, 

 we quote the following wholesale prices : — 



Sulphate of copper (in crystals) . . • per lb. 6 cts. 



Copper carbonate n 40 n 



Aqua ammonia, 26° n 8 n 



Ammonia carbonate „ n ,, 



and based upon these values, the vineyardist who is provided with a force pump, 

 can treat his vineyard for one-third cent per vine each application, and with 

 sulphate of copper for one-half of that sum. The Bordeaux mixture will cost 

 about one-half cent per vine for each application. 



The ammoniacal solution of carbonate of copper can be prepared in an easier 

 way than that already given, by using pulverized ammonia carbonate instead of 

 liquid ammonia, thus : Mix thoroughly six ounces pulverized ammonia carbon- 

 ate and one ounce of copper carbonate, keep it in an air-tight vessel, and when 

 ready for use, dissolve in ten gallons of water. 



Convenient measures for copper carbonate are also suggested by Mr. Gallo- 

 way. They are made by the use of a baking powder tin, first weighing the tin, 

 then adding, say, an ounce of the chemical and marking the place. In the same 

 way, two ounce and five ounce measures can be prepared. 



TREATMENT OF APPLE SCAB. 



PPLE scab can now be prevented so easily and cheaply that there is 

 no longer any excuse for the injury it occasions. We first success- 

 fully treated this disease three years ago and since that time our 

 methods of work have been considerably improved. Briefly the 

 treatment we would now recommend is as follows : 



When the fruit is about the size of a pea, spray the trees thoroughly 

 with a solution made by dissolving five ounces of carbonate of copper in one 

 and one-half pints of aqua ammonia having a strength of 26°. The copper may 

 be dissolved in an ordinary water pail. When completely dissolved pour the 

 liquid into a barrel, and then fill the latter with water. A barrel of the solution 

 made in this way will cost about thirty-five cents, and it will be sufficient to treat 

 fifteen large trees once. Make a second spraying twelve or fifteen days after the 

 first, and the third two weeks later. If an ordinary season, three sprayings will 

 be sufficient, but if rainy it will be necessary to make one or two more. In 

 applying the solution it is of the highest importance that the leaves and fruit be 

 thoroughly covered, and this is only made possible by using a good strong force 

 pump, provided with a suitable spraying nozzle. Such a machine need not cost 

 over $12 or $15, and where one has a larger orchard this amount will be easily 

 saved in a short time. 



The carbonate of copper is sold at retail for 40 cts. to 75 cts. a pound. It 



