90 TKANSACTIONS OF THE ILLINOIS 



The " Bordeaux " mixture spoken of is made of sulphate of 

 copper, blue vitrol and lime, as follows ; Fifteen pounds of sulphate 

 of copper is dissolved in twenty gallons of water, and thirty pounds 

 of quicklime are slacked in ten gallons of water. When the former 

 is completely dissolved and the lime thoroughly slacked and fine, the 

 latter is poured into the copper solution, while actively stirring. A 

 fine blue precipitate settles to the bottom which must be stirred up 

 as applied. 



The application may be made v^ith a watering can with fine 

 rose or, much better, with a force pump giving a spray as for poi- 

 soning insects. 



"Eait celeste''^ or "blue water," is made by putting in a stone 

 or glass jar about four and a half pounds of sulphate of copper and 

 turning upon it three quarts of water. It may be stirred to hasten 

 solution. Add one quart of liquid ammonia, and stir. The result 

 should be a blue liquid, holding in a very finely divided state, the 

 insoluble matter. The above quantity should be diluted so as to 

 make about twenty-five to forty gallons. 



There is no longer doubt as to the possibility of destroying the 

 downy mildew (Peronspora) with these sulphate of copper mixtures, 

 but further experience is needed upon black rot. In the Champaign 

 district the grapes were, this year, almost perfectly free from disease 

 of any kind, and the quality was never better. The dry season, with 

 an abundance of dear sunshine, seemed to favor the vines and de- 

 velop the fruit. In some other portions of the State the rot was 

 very destructive. In these localities bagging proved again entirely 

 successful, if early done. 



DISCUSSION. 



H. M. Dunlap — Is Vergennes affected with rot ? 



E. A. Riehl — Everything bagged the first three or four days of 

 June were perfectly protected, while those bagged later were more 

 or less affected. 



Prof. T. J. Burrill — Mr. Scribner says a mixture of sulphate of 

 copper and lime applied to the grape as soon as the foliage shows 

 its form, prevents the black-rot. This is the only form of grape-rot 

 that prevails much in this section. 



Prof. Van Deman — Prof. Scribner had planned to attend this 

 meeting, but was unavoidably detained in Washington. He desired 

 me to say that he had anticipated much pleasure in making the 

 acquaintance of many of the prominent horticulturists of the West, 

 and that his inability to do so was a great disappointment. Bagging 



