Remedies: The presence of the insect can be detected by the small holes
in the bark of the trees and the fine sawdust which is ejected from
these holes, when the insects are active. It is important to
emphasize the advisability of detecting the fine sawdust because
that is the best indication of the actual operations of the hickory
bark borer. These holes, however, will not be noticeable until the
insect has completed its transformation. In summer, the infested
trees show wilted leaves and many dead twigs. Holes in the base of
the petioles of these leaves are also signs of the working of the
insect. Since the insect works underneath the bark, it is
inaccessible for treatment and all infested trees should be cut down
and burned, or the bark removed and the insects destroyed. This
should be done before the beetles emerge from the tree in June.


PLANT LICE OR APHIDES

These often appear on the under side of the leaves of the beech, Norway
maple, tulip tree, etc. They excrete a sweet, sticky liquid called
"honey-dew," and cause the leaves to curl or drop. Spraying with
whale-oil soap solution formed by adding one pound of the soap to five
gallons of water is the remedy.



STUDY II. TREE DISEASES

Because trees have wants analogous to those of human beings, they also
have diseases similar to those which afflict human beings. In many cases
these diseases act like cancerous growths upon the human body; in some