
ee 
gray birches growing there. It is quite clear that the primary 
cause of the death of these trees is the bronze birch borer, an 
insect that has proved very destructive to birch trees in various 
localities, especially in parks. All of the dead and dying trees 
in the Garden were badly infested with this insect. It appears 
that no remedy for this borer has been found that does not 
involve the destruction of the tree. It is likely that little can be 
done to save the remainder of these trees, although the complete 
removal of all infested trees in the late winter may be effective in 
destroying the borers and so protecting the uninfested trees. 
Associated with the bronze birch borer, however, were various 
fungi. Cytospora horrida Sacc. was found to occur with great 
regularity on the small branches of the trees whose main branches 
had been killed by the borer. This fungus fruited abundantly on 
branches up to one half inch in diameter or slightly larger. An- 
other fungus of very common occurrence was Melanconium bi- 
color Nees. The fruiting bodies of this fungus developed quite 
extensively on large branches and even on the main trunk of the 
tree. It was not unusual to find the spore pustules being pro- 
duced on the canker-like areas produced on the limbs by the borer. 
The leafspot of the sycamore, Gnomoma veneta (Sacc. & 
Speg.) Kleb., was again common in both the Park and the Botanic 
Garden. This disease, however, was not nearly so severe this 
year as last. There was considerably less defoliation of the trees 
in late June and early July during the present season. Still the 
disease was conspicuous on the trees. 
The catalpa leaf spot, Phyllosticta catalpae Ell. & Mart., was as 
common as during the preceding season. Most of the trees in 
the Park were extensively defoliated during July. Most of the 
leaves on these trees had numerous infected spots, which, in some 
cases, included more than half the leaf area. 
he leaf spot of the tulip tree, Phyllosticta liriodendri Thuem., 
was also prevalent. It appears that this fungus is associated 
with leaf areas killed by the development of the larva of an 
insect. These dead leaf spots were quite abundant, but the fruit- 
ing bodies of the fungus did not occur frequently. 
The shot hole fungus, Cercospora circumscissa Sacc., was very 
common on small trees of the Japanese-cherry and peach which 
