8 4 



The Canadian Horticulturist. 



GOOD RESULTS FROM SPRAYING. 



XPE RIMENTS in spraying have been carefully 

 made under the supervision of the United States 

 Department of Agriculture. The work has been 

 executed by the Geneva Experiment Station; in New 

 York State; by Professor Taft, in Wisconsin, and 

 by the Department in the vicinity of Washington. 

 The object was to learn the comparative effici- 

 ency of the various fungicides, and the frequency 

 of application necessary to insure the best results. 

 The conclusions appear to be in favor of the Bor- 

 deaux mixture as the most effective remedy, and of 

 early applications. 



The formula for making the Bordeaux mixture, full strength and half 

 strength, is here given : 



BORDEAUX MIXTURE, FULL STRENGTH. 



Copper sulphate pounds.. 6 



Lime (unslaked) ,, . . 4 



Water gallons. .22 



BORDEAUX MIXTURE, HALF STRENGTH. 



Copper sulphate pounds . . 3 



Lime (unslaked) . . . . M . . 2 



Water gallons . . i"2 



The full-strength Bordeaux mixture will probably be no longer A 



used, as the half-strength preparation has been found to be equally ^-sJq 

 effective. 



As an example of the benefit of the use of this mixture, Fig. 512 

 shows two bunches of grapes (a) treated with Bordeaux mixture one- 

 half strength for black rot, and one (b) not treated. The latter is A 

 almost ruined with the rot, while the former is nearly perfect. 

 These are not picked samples, but chosen out of many similar 

 ones. \ 



The benefit in the case of apple scab is also very evident. (jfi^ 

 Fig. 5 r 3 shows the average results of three sets of eight apple trees 

 treated for scab with copper carbonate and Bordeaux mixture as QS|. 

 shown. The fruit, when harvested, was separated into first, second ^ 

 and third qualities, and the proportions are indicated in the engrav- FlG - 512 - 

 ing, white showing first quality, lines second quality, and black the third quality. 



Figs. 514 and 515 show the benefits gained in treatment of plum leaf blight 



