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ASH TREES DECLINE 
David L. Roberts,
Ph.D. |
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review of the Emerald Ash Borer Pg.1 Page 2 Next > Return to: EAB Homepage |
June,
2002 Newly emerged
flat headed wood boring beetle named the Emerald Ash Borer (EAB) associated with declining ash. (Fig. 2b.) |
David L. Roberts, Ph.D.
Michigan State University Extension
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| The Buprestidae beetle is a species of Agrilus planipennis, new common name Emerald Ash Borer. Note the green metallic coloration. (Fig. 3) | An emerging
beetle. S-shaped tunneling was created by last year's larval form of the insect. You can easily see the frass which is sawdust and insect excrement left by larvae. (Fig. 4) |
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| Section of wood showing beetle beginning to emerge. More of the tunneling patterns can be seen here. (Fig. 5) | A closer view of emerging beetle in Fig. 5 (Fig. 6) |
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| The whole beetle has
now emerged
from the bored hole it made. (Fig. 7) To view a close-up,click here (Fig. 7a) |
The
beetle continues
to move across the wood piece, even though he could easily fly away at anytime. (Fig. 8) To view a close-up,click here (Fig. 8a) |
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| Insect emergence holes are D-shaped.
The larger jagged holes and scraped bark were accomplished by
woodpeckers
which feed on the insects. (Fig. 9) To view a close-up, click here (Fig. 9a) |
A group
of declining ash trees. Lighter bark areas were created by woodpecker activity. This activity may be the first signs of EAB in your area. (Fig. 10) To view a close-up, click here (Fig. 10a) |
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| This canker was formed by EAB larval activity beneath the bark at least two years ago. The callus formation (thick margin of the canker) demonstrates that the tree is trying to heal and recover from attack. Note that the original serpentine tunneling still evident in the center of the canker. Such areas may be invaded in a natural progression by fungi which may also form cankers. (Fig. 11) | Three
ash
trees showing various states of decline, ranging from almost healthy to tree death. (Fig. 12) |
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| Downy or hairy woodpecker looking for food on an ash tree. Wood boring insects are the favored food for these birds which can act as significant biological control agents. (Fig. 13) | Side
angle of the hairy
woodpecker taken from ground level. (Fig. 14) |
To estimate scale size of the beetles hold a quarter to your pc screen here. Fig. 15David L. Roberts, Ph.D.
Michigan State University Extension Southeast
28115 Meadowbrook Rd., Novi, MI 48377-3128
Campus:
Michigan State University
B17 Plant & Soil Sciences
East Lansing, MI 48824-1359
For comments or questions email: robertsd@msu.edu
Enlarged close up of two metallic wood boring beetles for size comparison with a quarter. One is inverted showing the green metallic coloration. (Fig. 15.) The slender, elongate adults are 7.5 to 13.5 mm long and females are larger than males.
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