twig, or dead area of some kind on the bark, apparently not 

 killed by the fungus, from which the infection appeared to spread. 

 The end of the branch being killed, dead spots are sure to appear 

 lower down, from lack of food, and the spores washed down by 

 the rain find easy entrance. Thus it frequently happens that a 

 small infected branch will often lead to a serious infection of the 



the whole length of the branch. 



In the case of large branches, the ends of which are killed, 

 one side of the branch may entirely die, thus affording an easy 

 and speedy entrance of the fungus directly into the trunk. It is 

 on this account that pruning large infected branches often fails of 



In this connection it may be interesting to give a brief outline 

 of the results of the infection experiments with young trees in the 

 propagating houses mentioned in my former article. In one set 

 of experiments, the fungus, taken from pure cultures, was intro- 

 duced through wounds into the living tissues of the branch. As 

 may be seen from the accompanying illustrations, the branches 

 thus infected have all died. An attempt was made in another 

 set of experiments to infect young twigs and unfolding buds 

 without removing the cortex. No infections of this kind were 

 successful. Other infections were made upon the cut ends of 

 branches and the progress of the disease down the branch toward 

 the trunk observed. A number of check trees were kept in each 

 case and they have all remained perfectly sound. 



Interesting observations were also made on the progress of the 

 disease during the summer in young trees in the nursery outside. 

 One of these in particular was mentioned and figured in the June 

 Journal. A comparison of the condition of the tree early in May 

 with its condition now, as seen in the accompanying illustration, 

 will show how rapid and how deadly the work of this fungus 



I have no treatment to suggest further than the preventive 

 measures already mentioned. I realize the extent of the calamity 

 in New Jersey, Maryland, Virginia, and other states where the 

 disease is known to occur, if it is as virulent as it is with us. 



