142 The Connecticut Pomological Society 



itself and not the loss of foliage, which was responsible for the 

 blighting of the fruit. 



The 2-4-50 Bordeaux mixture stands on the border line 

 between the safe and the dangerous fungicides. Only in excep- 

 tional cases, owing apparently to some inherent weakness in 

 individual trees, did it cause injury comparable in degree with 

 that caused by any of the stronger mixtures. On the other 

 hand, it did injure the foliage to some extent on every tree to 

 which it was applied. Nevertheless, inasmuch as it did not 

 induce very serious dropping of the foliage, and left the fruit 

 practically uninjured, there is some probability that good results 

 may, on the whole, attend its use, especially during the early 

 part of the season. 



With the use of Bordeaux mixture reduced to a 1-2-50 

 formula, it became apparent that the danger point had been 

 passed. No injury to either the foliage or the fruit followed two 

 thorough applications of it. The same was true of the potassium 

 sulphide solution. This was used continuously throughout the 

 season and caused hardly a trace of injury. 



Peculiar results attended the use of copper acetate late in the 

 season. This solution had been very highly recommended as a 

 spray for peach trees by the Delaware Experiment Station, and 

 no bad results were anticipated. The salt was purchased at a 

 local drug store, dissolved in the proportion of 8 ounces to 45 

 gallons of water, and applied to several Early Rivers trees on 

 July 18. On July 31 the orchard was visited in order to repeat 

 the treatment, when, greatly to my surprise, the ground beneath 

 the sprayed trees was found to be covered with yellow and 

 spotted leaves; from 10 to 20 per cent appeared to have fallen. 

 The fruit showed no injury, but it was, at that time, well ad- 

 vanced toward maturity. Of course the treatment was not 

 repeated, but the salt used was at once subjected to chemical 

 analysis. It proved to be, not the normal acetate of copper, 

 but the sub-acetate, commonly known as verdigris. It then 

 occurred to me that the Delaware people had probably used the 

 normal acetate, and I at once wrote to them for information. 

 Receiving no reply, I purchased other lots of so-called normal 

 copper acetate both in New Haven and New York. In all 

 cases they proved to be verdigris. I was finally driven to pre- 



