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FORMULA. 



Each quart will contain 2 ounces of the carbonate of copper, which, when added 

 to 25 gallons of water, will furnish a solution for spraying, of the same strength and 

 character as that obtained by the use of the dried carbonate, and one which can be 

 prepared with little labour, and kept ready for use throughout the season. 



CARBONATE OP COPPER IN SUSPENSION. 



When the carbonate is to be used in suspension, instead of adding the ammonia 

 to the sediment, add water until the whole quantity is made up to 6 quarts. Stir 

 this thoroughly until the sediment is completely suspended (entii-ely mixed through- 

 out) and pour the thick liquid into a suitable jar, when it will be ready for use. 



Befoie using shake the contents thoioughly, so that all the sediment may be 

 ovenly distributed in the water. Pour out a quart of the thick fluid and mix in the 

 25 gallons of water. The unwashed solution is prepared by simply pouring the two 

 solutions together (copper sulphate and sal soda), and when the effervescence has 

 ceased, pouring off the top or supernatent liquid ; add four quarts of strong ammonia, 

 stirring in well, then add suflScient water to bring the whole quantity up to 6 quarts. 

 The formula is the same as that already given above. 



The unwashed suspension is prepared in the same way, water taking the place of 

 ■ammonia in making the quantity up to 6 quarts. 



GEAPE MILDEW. 



As stated elsewhere, grape mildew (Peronospora viticola) was effectually kept 

 in check in the farm vineyard by three applications of ammoniacal copper carbonate, 

 as recommended in Bulletin No. 10. 



With the co-operation of his Honour Judge Mosgrove, an extensive grape-grower 

 on the Richmond road, a series of experiments were planned and designed : (1) To 

 show the relative effectiveness of different strengths of copper carbonate in solution 

 and in suspension; (2) To show the benefit of spraying the vines, immediately on 

 being uncovered, with copper sulphate. 



The results, owing to the appearance of an unlocked for and unexpected disease 

 (Sphaceloma ampelinum), have not been conclusive, and the work will be continued 

 another season, when it is hoped the objects of the experiment will be attained. 



Little if any mildew appeared in any case uponthefrait of those treated, though 

 in a few instances the foliage was affected. 



The first application was made on 22nd May, using a solution of copper sul- 

 phate, 1 lb. to 25 gallons of water. This was followed by four applications of the 

 ammoniacal copper carbonate, made on the following dates : 2nd, 13th and 30th 

 June and 3l8t July, 



While this treatment was generally satisfactory in the case of the downy mil- 

 dew, it was not so with " bird's-eye rot " (Sphaceloma ampelinum). In order to rid 

 the vineyard of this pest, treatment was commenced this fall by carefully burning 

 all rubbish and trimmings, and spraying one-half of the vines with a strong solution 

 of copper sulphate, the other half with iron sulphate. Next spring, on the vines being 

 uncovered, they will be again treated with the copper and iron solution, followed by 

 dilute Bordeaux mixture and ammoniacal copper carbonate, used in a comparative 

 way. It is hoped that by this tx*eatment both the bird's-eye rot and downy mildew 

 will be controlled. 



GOOSEBEERY MILDEW. 



Comparisons were made as to the effectiveness of copper carbonate, in solution 

 and suspension in different proportions, and potassium sulphide used also in varying 

 quantities. While the disease {Sphaerotheca mors-uvce) was not as prevalent as usual 

 this year, yet on the European varieties and seedlings it was suflSciently active to 

 jnake the results quite conclusive. These are summarized as follows : — 

 7f— lOJ 



