288 Agkioultfral Experimekt Station, Ithaca, N. Y. 



The Bordeaux mixture did not injure the foliage, whether London 

 purple was added or not. As above . prepared it is a perfectly safe 

 fungicide to use on peach trees and the addition of London purple 

 does not render it caustic. 



Fostite did no injury to the foliage. The reason for this may be 

 that the leaves of the peach are so smooth that the powder will not 

 adhere to them. At least it was difficult to make what may be called 

 a heavy application, as the powder blew through the trees, very little 

 apparently being retained by the leaves. It is also possible that peach 

 leaves are not affected by the caustic action sometimes shown by 

 Fostite. 



The animonical copper carbonate, when used alone, seriously injured 

 the foliage after three applications had been made, fully 75 per cent, 

 of the leaves dropped from the trees and the remainder showed injury, 

 more or less serious. 



When Paris green and lime were added to the amraoniacal solution 

 two applications showed considerable injury to the foliage. Three 

 applications caused from five to ten per cent of the leaves to fall, 

 about ten per cent of them were yellow, but the remainder showed 

 comparatively little injury. Possibly this decrease in the extent of 

 injury may in part be due to the variety treated, but it is scarcely 

 probable that this influence was very great. 



The action of Paris green was exceedingly caustic. Two applica- 

 tions caused nearly a fourth of the leaves to drop from the trees, while 

 soon after the third application about 75 per cent fell to the ground. 

 It is unsafe to use Paris green upon peaches, unless the mixture be 

 made very weak. 



London purple did still more damage than Paris green. Fully 90 

 per cent of the leaves dropped from the tree after the third applica- 

 tion. This result coincides with those previously obtained by various 

 experimenters, particularly those published from this station in 1890.* 



*See Cornell Experimental Station Bulletin XVIII, July, 1890, for detailed 

 accounts of London purple and Paris green upon peach foliage. Analyses of 

 these arsenites are also given. 



