S58 PLUM. 



however, one ounce to twenty gallons of water is sufficient. 

 London-puriDle in the proportion of one part to twenty parts 

 of water was considered by the Committee to be destructive 

 to the caterpillar, and while slightly scorching the foliage did 

 not materially injure it." 



By the time of the next meeting the benefit of the treat- 

 ment was so obvious that applications were coming in from 

 gardeners of the neighbourhood to the Committee, for in- 

 formation how they also could save their trees. 



On application to Mr. C. D. Wise, Deputy- Superintendent 

 at the Fruit-grounds at Toddington, for a short note as to 

 progress, — in order that I might report results of our work up 

 to date, — on the 3rd of June, at the meeting of the Seeds and 

 Plants Disease Committee of the Royal Agricultural Society, 

 he favoured me with the following reply : — 



" We have as you know tried all sorts of mixtures, and I 

 don't think it is worth while troubling you with all particulars 

 of them, as they were all useless or nearly so. Paris-green is 

 the only thing which we have found really efficacious. For 

 Plums the proportion is 1 oz. to 10 gallons, and for Apples 

 1 oz. to 20 gallons. We have also used the former strength 

 for Currants, but as the foliage is within the last few days 

 becoming so much stronger, we have been using it at 1 oz. to 

 8 gallons. Neither of these solutions has damaged the foliage, 

 but killed the caterpillar. ... As regards the Eiley 

 nozzle, we have tried it and found it very similar to that on 

 the French pumps ; in fact, there is very little difference 

 between the two, that is, in the way the liquid is distributed." 



Mr. Masters, also, the Secretary of the Evesham Experi- 

 mental Committee, replied, still continuing the previous in- 

 formation as to the efficac}^ of the Paris-green in destroying the 

 caterpillar, and also considered there was confirmatory proof 

 that the Paris-green might be used with perfect safety to 

 foliage at a greater strength than that mentioned above. 



I also requested information from Messrs. A. Salmon (Fruit- 

 growers), near Hounslow, with whom I had been in com- 

 munication relating to orchard use of Paris-green, in order to 

 obtain a report of the effects of the application, on a regular 

 scale of working business independent of our special experi- 

 ments, with ordinary garden engines. Messrs. Salmon re- 

 ported in reply, on the 81st May : — " All we can say about it 

 is to its advantage. It has succeeded admirably. The trees 

 look healthier and better, with as much (if not more) on, as 

 anywhere else. They are beautifully clean. It has not in- 

 jured them in the slightest degree. We shall always use it in 

 case of blight." 



