Does Your Ash Tree Have the
Emerald Ash Borer?
At this time the answer to the title question is most likely “No.”
There have been numerous stories in the local newspapers regarding
the emerald ash borer and this is making homeowners examine their
trees. Many are finding holes in their trees and worrying that the
tree has this new insect.
What most people don’t realize is that there has been another
type of ash borer in our area for many, many years. It is commonly
attracted to ash trees that are under stress and while it can kill
the tree, this is often a slow process and good maintenance of the
trees coupled with insecticide treatment at the proper time can
minimize the damage.
The emerald ash borer often does a lot of damage quickly. According
to the USDA Forest Service many trees lose as much as 30-50 percent
of their canopy in one year and the tree is often completely killed
in 2-3 years.
So, how do you know which borer is in your tree? Look at the holes
made. The ash borer we commonly see here makes a round hole, about
1/8-1/4 inch in diameter. The hole of the emerald ash borer is shaped
like a ‘D’ with one side being distinctly flat.
At this time, we should not panic about the emerald ash borer,
but we should be on the look out for it. The excerpt quoted below
is from Dr. Phil Nixon, University of Illinois Entomologist. It
was written in late August and gives an update on the location of
the insect in the Midwest:
"Continue to watch for emerald ash borer. Recently, new infestations
were reported in the Lansing, Michigan, area and in Ohio across
the state line from Fort Wayne, Indiana. These infestations are
considerably closer to us than those previously reported in the
Detroit, Michigan, and Toledo, Ohio, areas.
Movement of this pest from infested areas is most likely on firewood
and nursery stock. This pest was detected and identified in North
America in July 2002, but estimates are that it has been in southeastern
Michigan for 8 to 10 years. Ashes moved out as nursery stock during
that time could easily have been infested. This beetle is common
in younger as well as older trees. If you obtained nursery stock
from that area during the last 10 years, scout areas where it was
planted for signs of this beetle.
Infestations have been found in Michigan in green, white, and
black ash. It would likely attack blue ash as well, but that plant
is not common in southeastern Michigan. In Asia, it attacks Ulmus
davidiana var. Japonica, used in some crosses for
American elm replacement varieties. Look for 1/8-inch, D-shaped
holes in the bark—similar to exit holes of bronze birch borer.
Infested ash trees first show dieback of upper branches, progressing
to death of major branches, water sprouts on the trunk, and finally,
water sprouts at the base of the otherwise dead tree. If suspects
are found, contact the Illinois Department of Agriculture.”
October - November 2003:
| Does Your Ash Tree Have the Emerald Ash Borer? | Chrysanthemums
| Protect Home From Crickets