40 N. J. Agricultural Experiment Stations Bulletin 356 



prepared from leaves of yellows and little peach trees and also from 

 premature yellows fruits and inserted into healthy trees in small test 

 tubes. Grooves were cut in the trunks near the ground with a chisel, 

 the tubes of solution inserted in them and the grooves sealed with 

 grafting wax. None of the trees developed disease as a result of 

 these inoculations. 



Fig. 23 — Yellows Developing in the Nursery the Season Follow- 

 ing Budding With Diseased Fitzgerald Buds 



Occasional Healthy Branches on Diseased Trees 



Previous investigations have shown that buds from apparently 

 healthy branches on diseased trees invariably produce yellows when 

 budded upon healthy stock although it may be several seasons before 

 the symptoms appear. During 1916, when special studies on translo- 

 cation of plant-foods were being made, an Early Crawford tree de- 

 veloped yellows in one small branch and the fruit on it matured 

 about one week in advance of normal. The remainder of the tree 

 ripened its fruit at the normal time and showed no abnormal color- 

 ings. Starch tests in the early morning showed an accumulation of 

 starch in the midribs of the leaves on all branches except one which 

 behaved normally in every way. Buds were taken from this branch 

 and from the diseased one and transferred to healthy seedlings in the 



