The Canadian Horticulturist. 103 



substance is not usually kept in stock, it will be necessary to order it some time 

 before it is needed. 



In the opinion of Mr. E. S. Goff, of the University of Wisconsin, there is 

 nothing better than the copper carbonate as a remedy for the scab, and, while he 

 recommended ammoniacal solutions as the most effective, he advises those who 

 are spraying with Paris green for the codling moth, to add also precipitated 

 copper carbonate powder to the water, in the proportion of one ounce to twenty- 

 five gallons. 



Prof Taft, of Michigan, has been making extended experiments for the de- 

 struction of the apple scab. He thinks that modified Eau Celeste gives the best 

 result, and that in his experiments he has saved from 50 to 75 per cent, of fruit 

 that otherwise would have been scabby. The formula is as follows : Two 

 pounds sulphate of copper, 2^^^ pounds carbonate of soda, and i}^ pints of 

 ammonia (22" Baume). Dilute with 32 gallons of water. 



FURTHER ADVICE ON TREATING APPLE SCAB. 



Since writing the preceding article we have received the following additional 

 advice on the best treatment of scab. 



From E. S. Goff, Horticulturist at the University oj Wisconsin 

 Experimental Station. 



Sir, — It has often been recommended to use three ounces of carbonate of 

 copper to one quart of ammonia, but I have been unable to dissolve more 

 than one and one-quarter ounces in one quart. If more is added, it settles to 

 the bottom without dissolving. I now recommend one and one-quarter ounces 

 of precipitated carbonate of copper to one quart of ammonia. 



So far as I can see from our work of the past season, double the amount of 

 carbonate of copper suspended in water is as efficient as that dissolved in 

 ammonia. Owing to the very abundant and frequent rains during June, our 

 work did not show as well the past season as in the season of 1889, but the 

 applications were beneficial. 



I cannot say at present, whether it is better to use the carbonate of copper 

 suspended in water, or to dissolve it in ammonia. Another season's trial, I hope, 

 will answer this question definitely. 



From L. R. Taft, M.S., Professor of Horticulture at Michigan 

 Agricultural College. 



Sir, — In a favorable season I think you would have best results from per- 

 haps three applications of modified Eau Celeste, made by dissolving two pounds 

 copper sulphate in one vessel, two pounds carbonate of soda in another, pouring 

 together and adding one pint of 20° ammonia, and thirty-two gallons 

 of water. If it comes off cold and wet just before the blossoms open, I should 

 spray them. Never spray while in blossom, on account of the bees. 



You will find this an insecticide, but I am not sure whether it can be relied 

 on to destroy the codling moth. Never add any arsenite to the fungicide as the 

 ammonia will dissolve it and the foliage will be injured. 



