The Hickory Bark Borer
Life history: This insect is a small brown or black beetle in its mature
form and a small legless white grub in its winter stage. The beetles
appear from June to August. In July they deposit their eggs in the
outer sapwood, immediately under the bark of the trunk and larger
branches. The eggs soon hatch and the grubs feed on the living
tissue of the tree, forming numerous galleries. The grubs pass the
winter in a nearly full-grown condition, transform to pupae in May,
and emerge as beetles in June.
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.
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Tree Studies
How To Identify Trees
Group I The Pines
The White Pine (pinus Strobus)
The Pitch Pine (pinus Rigida)
The Scotch Pine (pinus Sylvestris)
Group Ii The Spruce And Hemlock
The Norway Spruce (picea Excelsa)
Hemlock (tsuga Canadensis)
Group Iii The Red Cedar And Arbor-vitae
Red Cedar (juniperus Virginiana)
Arbor-vitae; Northern White Cedar (thuja Occidentalis)
Group Iv The Larch And Cypress
The European Larch (larix Europaea)
Bald Cypress (taxodium Distichum)
Group V The Horsechestnut, Ash And Maple
The Horsechestnut
The White Ash (fraxinus Americana)
Sugar Maple (acer Saccharum)
Silver Maple (acer Saccharinum)
Red Maple (acer Rubrum)
Norway Maple (acer Platanoides)
Box Elder (acer Negundo)
Group Vi Trees Told By Their Form: Elm, Poplar, Gingko And Willow
American Elm (ulmus Americana)
Lombardy Or Italian Poplar (populus Nigra, Var Italica)
Gingko Or Maidenhair Tree (gingko Biloba)
Weeping Willow (salix Babylonica)
Group Vii Trees Told By Their Bark Or Trunk: Sycamore, Birch, Beech,
Blue Beech, Ironwood, And Hackberry
The Sycamore Or Plane Tree (platanus Occidentalis)
Gray Or White Birch (betula Populifolia)
American Beech (fagus Americana)
Blue Beech Or Hornbeam (carpinus Caroliniana)
Hackberry (celtis Occidentalis)
Group Viii The Oaks And Chestnut
White Oak (quercus Alba)
Black Oak (quercus Velutina)
Red Oak (quercus Rubra)
Pin Oak (quercus Palustris)
Chestnut (castanea Dentata)
Group Ix The Hickories, Walnut And Butternut
Shagbark Hickory (hicoria Ovata)
Mockernut Hickory (hicoria Alba)
Black Walnut (juglans Nigra)
Group X Tulip Tree, Sweet Gum, Linden, Magnolia, Locust, Catalpa,
Dogwood, Mulberry And Osage Orange
Tulip Tree (liriodendron Tulipifera)
Sweet Gum (liquidambar Styraciflua)
American Linden (tilia Americana)
The Magnolias
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