LOCAL ACTION OF CURL ON FOLIAGE AND FKUIT. 125 



seen in the condition of the foliage and crop on the sprayed and 

 unsprayed sides of the other trees inchided in these experiments. 



It even appears likely, both from observation of the trees and from 

 the general laws of use and disuse and supply and growth, that the 

 influence of the sprayed upon the unsprayed portions of the tree, in 

 the presence of an attack of curl, is detrimental rather than beneficial. 

 It is probable that the half of the tree in full foliage, instead of lend- 

 ing material aid to the defoliated side, tends to further rob that side, 

 at least of the crude sap coming from the roots. 



For the purpose of showing the reader the striking results ol^tained 

 from these trees, several photographs were made at the time the crop 

 was matured. In order that the fruit might be seen upon the tree 

 the foliage was carefully cut away and a screen placed ])ehind the 

 tree (PI. XVII). A single limb was also photographed, as shown in 

 PI. XIX. The fruit gathered from the sprayed and unsprayed halves 

 of tree 1 is likewise shown in PI. XVIII. The unusual size and 

 brightness of color of the fruit from the sprayed half of this tree was 

 ver}' marked. The peaches averaged 252 per 100 pounds. The aver- 

 age of peaches for the large experiment block was, as before stated, 

 299 per 100 pounds. There was thus a gain of 18.66 per cent in size 

 of fruit on the sprayed half of this tree over the average for the block. 



