The Canadian Horticulturist. 395 



Our corrcspondc-nt was wise in using sulphate of copper and lime, or Bord- 

 eaux mixture, for the scab. It is very effective, and this, or some similar solution 

 of copper, seems to be the hope of future apple and pear growing for profit. 



The miklew of the grape and the rot of the potato are also effectually 

 checked by its use. But in all cases the work needs to begin in good time, 

 before the disease has developed, as the ai)pli(,ation is nKjre preventive than 

 remedial. 



The Bordeaux Mixture is thus formed : — Dissolve six {)ounds of sulphate 

 of copper in sixteen gallons of water; in another vessel slack four pounds 

 of fresh lime in six gallons of water. When the latter mixture is cool, it is 

 slowly poured into the copper solution, care being taken to mix thoroughly by 

 constant stirring. Prepare some days before using. Stir before applying. This 

 is somewhat exi)ensive, when a large amount is required, and it is thought by 

 experimenters that one-half the strength will be quite effectual. 



Spraying the trees and vineyard in winter or early spring with sulphate of 

 copper, one j)ound to twenty-five gallons of water, is also useful, becau.se the 

 spores must live through the winter on the old wood, and may at this season be 

 destroyed by such a powerful solution as could not be safely used when the foliage 

 is out.i We could not say whether the Bordeaux mixture would be useful in thecase 

 of the curl leaf of the peach. The foliage is very tender and these poisons must be 

 applied to it very cautiously. 



PARIS GREEN AND THE CODLINCx MOTH. 



>502. — SiK — Is Paris green \nything like a check upon the codling moth ? Do you find 

 that lime mixed with Paris greeu lessens its effect ? I have found Paris green no use, seven 

 teaspoonf uls to forty gallons of water, lime ad, lib. 



W, T. Payne, Pokeno, New Zealand. 



In our experience we have found that a careful application of Paris green is 

 very u.seful in checking the working of the codling moth. Applied in a fine 

 spray, in the strength of one i)ound to two hundred gallons of water, it will 

 result in fruit comparatively free from injury by either the codling moth, or the 

 curculio. Possiblya weaker solution might suffice. Anyway care must be taken to 

 keep the poison thoroughly stirred, or it will settle at the bottom and the dregs 

 of the barrel will be destructive to the foliage of the trees. 



Lime lessens the evil effects of Paris green upon the foliage, and probablv 

 also upon the moth, although we have not proved this. Certain it is that a much 

 larger quantity of poison may be used if lime is added. 



Probably our correspondent used too little Paris green considering the 

 amount of lime used. 



