EXPERIMENTS WITH DRY BORDEAUX. 

 Chas. D. Woods. 



For a number of years dry Bordeaux has been upon the 

 market. The best known is that made by Leggett and Brother, 

 New York, and first sold under the trade name of fungiroid. 

 This is made by using equal weights of lime and sulphate of 

 copper. As used by us the past season, this dry Bordeaux 

 carried practically the amount of copper claimed by the makers. 

 It would therefore take lo pounds of the dry Bordeaux mixture 

 to furnish the same weight of copper as carried in 50 gallons of 

 Bordeaux mixture prepared in accordance with the directions of 

 this Station. Dry Bordeaux has been used successfully upon 

 fruit trees, particularly in the middle west and southwest. Thus 

 used it is greatly reduced with dry powdered lime. For potatoes 

 the manufacturers recommend that it be reduced with one part 

 of fine lime to 2 parts of dry Bordeaux. While it can be wet 

 up and applied with a spray, it is designed to be used dry and 

 applied with a powder gun. 



In some localities it is a difficult problem to obtain the needed 

 water for spraying and this, because of the labor involved, is, at 

 times, the most expensive part of spraying. For this reason it 

 was deemed of value to test dry Bordeaux applied as a dust 

 against the ordinary Bordeaux mixture applied as a spray. 

 Since it would be impracticable to use it on a large field while 

 the foliage was still wet from dew, it was in this test applied in 

 bright sun with the tops perfectly dry and even when the wind 

 was quite strong. If it would not protect under these condi- 

 tions, however valuable it might be for the garden where it can 

 be applied on vines wet from dew or rain, it would-be of no 

 value for extended field use. 



the; e;xpe;rime;nt. 



Two acres planted to Green Mountain potatoes, on the farm 



of John Watson, Houlton, were selected for the experiment. 



The field was planted about the twentieth of May and at the time 



it was selected there was a good even stand, and the field had 



