97 



"The oldest leaves are most susceptible to injury from arsenical applications; 

 they often turn yellow and drop, without showing the burnt spotted appearance." 

 * * ^ '< London purple, (Paris green and white arsenic have not yet been tried) 

 can be used at least eight or ten times as strong without injury to foliage, if applied 

 in common Bordeaux mixture instead of water." * >K * "The arsenites mix 

 readily in carbonate of copper solutions, and do not seem to do more harm than 

 when applied in water only." * * * *< London purple in sulphate of copper 

 solution, does vastly more harm than when applied in water only." 



In the Journal of Mycology, Vol. VI, No. 3, published by Prof Galloway and 

 assistants. Department of Agriculture, Washington, an account is given of results 

 of spraying grape vines to prevent black-rot with " Bordeaux mixture ; ammoniacal 

 copper carbonate solution ; copper carbonate in suspension ; and a mixed 

 treatment, consisting of three applications of the Bordeaux mixture, followed by 

 live of the ammoniacal solution." The following conclusions were reached : — 



I. " That while the amount of fruit saved by the Bordeaux mixture was greater 

 than that by the ammoniacal solution, the latter preparation is, after all, the cheapest. 

 In other words, there was more profit in using the ammoniacal solution than the 

 Bordeaux mixture." 



II. " A mixed treatment consisting of Bordeaux mixture and ammoniacal solu- 

 tion, is more profitable than a treatment of Bordeaux mixture alone, but not as 

 profitable as the ammoniacal solution alone." 



EFFECT OF FUNGICIDES ON APPLE LEAVES. 

 (Frank T. Shutt and John Craig.) 



The experiments, as set forth in the accompanying table, were instituted with 

 the following objects in view : — 



1. To ascertain the greatest strength in which the different fungicides can be 

 applied without injury to the leaves of apple trees ; 



2. To ascertain the effect on the leaves of the copper salts, with or without the 

 addition of ammonia ; 



3. To ascertain the effect on the leaves of apple trees, of a combined fungicide and 

 insecticide, using Paris green as the latter. 



The trees chosen for the experiment were of the Wealthy variety — a row set 

 out three years ago, in which all the trees selected were in an equally vigorous 

 condition. As shown in the table, a series comprising 14 combinations of fungi- 

 cides in different strengths was prepared. Each application was prepared on the basis 

 of a 22-gallon mixture, though the quantity used — the trees being small — was in each 

 case about 1 gallon. A tree was set aside for each preparation, and numbered in 

 accordance with the number of the mixture used. 



Series I, received three applications, notes being taken at short intervals after 

 each application. At the close of this series a new lot of ti-ees was selected ; these 

 received two applications, and were used as checks on the results of the first experi- 

 ments. 



6 c— 7 



