102 



REPORT OF THE COMMISSIONER OF AGRICULTURE. 



copper) ; and sulpliatine (a secret mixture of sulphur, lime, sulphate 

 of copper, and plaster). 



Table showing results of experiments of Millardet and David with Mildew remedies 



in France in 1S88. 



[In the second and third columns the scale is 10, zero indicating total destruction of foliage and 10 

 entire preservation. The small figure at the right and above denotes the number of times the 

 remedy was appUed.] 



Kind of remedy. 



No treatment 



Copper mixture of Gironde 



Copper mixture of Gironde, differ- 

 ent formula 



Copper mixture of Gironde, with ad- 

 dition of glue 



Eau celeste, or Audoynaud liquid *. . 



Eau celeste. Mr. Gayon's formula . . 



Solution of sulphate of oopper, i per 

 cent 



Solution of sulphate of copper, 1 per 

 cent 



Solution of sulphate of copper, 2 per 

 cent 



Solution of sulphate of copper, 3 per 

 cent 



Solution of sulphate of copper, 4 per 

 cent 



Milk of Ume, 1.5 per cent 



Milk of lime, 3 per cent 



Quick-lime, slaked and sifted 



David's powdert 



Podechard's powder 



Mixture of plaster and sulphate of 

 coppert 



Sulpho-steatite, or cupric steatite. . . 



Sulphatine (secret compound) 



Results. 



PC) . 

 be O 



c£53 

 o s3,a 



.£ aX2 

 £ F o 



C 03 O 



g'SffiS 

 o 



E S § S=' 



•- ,;g a a „' 



ii'g « S S 



S O 3 3 Ji 



113.6 

 196. 0^ 



192. 2» 



187. OS 

 153.821 

 138. 02 



138.8' 



160.02 



146.0* 



109. 4' 



153. 82 J 

 1.53. 8* 

 135. 2' 

 150. 25 

 200.0' 

 196. OS 



188. 6« 

 187. 0« 

 810. 6= 



Eemarks. 



These remedies were used only 

 once or twice at Beaucaillou, 

 because of great injury done 

 to foliage of the vines. The 

 vines at Dauzac. upon which 

 these were repeatedly used, 

 were in some cases so much 

 injured that the gi-apes did not 

 ripen. 



*For formula of Eau c61este, see p. 103, under "Audoynaud process." 



+ David's powder is made as follows: Slake 66 pound's of lime in the least possible amount of water, 

 and dissolve 17i poimds of sulphate of copper in the smallest quantity of v.-ater necessary to effect its 

 solution. Mix the latter v.-ith the lime when it is completely cooled. Let the compound dry in the sun, 

 then crush and sift it, when it is ready for use. 



X The plaster and sulphate of copper remedy is compo.sed of 66 pounds of plaster and 17 pounds of 

 sulphate of copper. The copper salt is dissolved in the least possible amoimt oi water, and then poured 

 upon the plaster. Mix thoroughly, dry in the sun, crush, and sift. 



In a letter to Prof. C. V. Riley, U. S. Entomologist, M. G. Foex, 

 of the National School of Agricu ture at Montpellier, France, under 

 date of November .30, 1886, having reference to the results and conclu- 

 sions reached at the International Congress mentioned below, says : 



The most interesting portion of the meeting at Florence was the discussions rela- 

 tive to the treatment of the Mildew. The efficacy of the salts of copper was boldly 

 proclaimed. 



The best formulae given are : 



(1) Bordeaux mixture* — The vines are sprinkle 1 during their vegetation with a 

 mixture of sulphate of copper and lime, prepared ns follows : 



In 100 liters f of water dissolve 6 to 8 kilograms X of sulphate of copper; in another 



*The same as the " Copper mixture of Gironde." Equals No. 3 m the circular of 

 remedies above quoted, with a slight reduction in the quantity of sulphate of cop- 

 per used. 



f One liter = 1.76 pints. % O^^e kilogram or kilo = 2.2 pounds. 



