30, 2007 17:09 PST
I looked over the selection of bug killers at Wal-mart today.
products from Bayer had imidacloprid in them.
Bayer Advanced Garden Tree and Shrub Insect Control is a 32 oz
that contains 1.47% imidacloprid. It is meant to be diluted and
around the base of the tree with a sprinkling can. The bottle is
I am wondering if this type of application would be effective,
the dilution ration should ideally be? I
understand it would be more
expensive than the generic chemical.
One thing I am wondering about is the tendency of imidacloprid
with humus under hemlock trees. Could you dig through the humus
into the substrate and apply it there instead?
You have mentioned generic imidacloprid powder under the names
WSP INSECTICIDE, TOUCHSTONE 75 WSP INSECTICIDE, Quali-Pro
75WSB, etc. Are there limits to who may sell these products or
30, 2007 18:00 PST
I have heard of good to excellent results from Bayer Tree and
Control. The dosage is the equivalent of the highest dosage that
applied via the powdered version that I use in my business. It
with one bottle treating only a 10" diameter tree. This
equates to ~$1.90
per diameter inch (with tax) versus ~ $.80 per inch for the
you mentioned. The biggest complaint I have heard is the
amount of water they recommend mixing the solution in. I don't
quite see the
need for so much water but then again, I don't use the product
In NC, anyone can buy the other products, which are a powder, at
agricultural insecticide dealer. As long as you are not applying
for profit you can buy and apply without a pesticide
The studies I have read indicate that hemlock roots are very
will exploit the upper layers of organic material so a topical
application is best. I have seen 4.5 years+ control of HWA from
drench application of imidacloprid at the median rate on the
Obviously there was no need to apply below the surface, although
applications now are just below the surface in the organic layer
30, 2007 22:29 PST
Ed and Will,
I think the Bayer product is what my mom is using on her White
'Autumn Purple' and Black Locust 'Purple Robe' for emerald ash
and locust borers. The white ash was never touched, so I can't
except that the tree is still alive in a sea of dead ashes. The
locust was ravaged the first year after we planted it, but it
been touched since treatment (three years now).
31, 2007 05:51 PST
If you are interested in purchasing imidacloprid for HWA you can
me at one of the numbers below. Our company has a product,
both a 75WSP and 2F (liquid) formulation that is imidacloprid
specifically at the tree care market. The largest tree care
the country are using it exclusively and the USFS and several
are using it this year. As Will said, we can sell both
private citizens as end users, however if you are going to offer
treatments as a service you will need a license. Later this
will carry a Xytect Infusible which is a injectible formulation
applied through our new refillable M3 infuser. Check out
Brandon Gallagher Watson
ISA Certified Arborist MN-4086A
Rainbow Treecare Scientific Advancements
2239 Edgewood Ave S
Minneapolis, MN 55426
31, 2007 17:47 PST
Will and Brandon,
Thank you for your replies. I was curious about this particular
The HWA is not here yet, although it may arrive later this
summer or next
year. At that time I will likely be buying stuff to treat a
trees or so in our small lot.
A. Keslick, Jr.
01, 2007 03:30 PST
Are we killing the good guys as well as the bad guys? For an
than 1% of the insects and fungi are harmful to humans. Think
when you use a product that kills everything. Trees have many
that address their quality of life.
John A. Keslick, Jr.
Beware of so-called TREE EXPERTS who do not understand TREE
Storms, fires, floods, earthquakes, and volcanic eruptions keep
that we are not the boss.
Some people will buy products they do not understand and not buy
will give them understanding.
01, 2007 05:52 PST
I don't think your way of thinking is crazy, just different.
Imidacloprid kills insects that feed on the plants that are
treated. It is not a contact insecticide. It is much more
friendly to the earth than systemic insecticides of the past. It
has a long residual so repeated applications aren't necessary. I
treated a copper beech in 2001 for wooly aphids. The population
had definitely breeched the threshold, as the honeydew sounded
like rain falling from the tree. With one application of
Imicloprid into the soil (no non targets were affected by air)
it cleared the problem up and they haven't been back. Oils and
other contacts do kill everything. Using IPM methods, this seems
to be the best choice. Imicloprid does not have fungicidal
properties to my knowledge.
02, 2007 16:39 PST
Killing not-target organisms is certainly unfortunately and to
avoided where possible. However, we need to evaluate our options
against alternatives rather than against currently impossible
Yes, imidacloprid will kill organisms that feed on hemlocks in
addition to the adelgid, and if applied to the soil, some soil
organisms in a localized area. What if we don't treat the
The hemlocks will die and the organisms that feed exclusively on
will have no food. The soil will be disturbed over a much
area; in some ways less intensively and in other ways more
intensively. If we had some way to attack the adelgids and only
adelgids that would be wonderful. The beetles are currently the
leading hope for that solution, but we haven't yet figured out
get them to reduce adelgid populations to trivial levels.
Hemlock and Adelgid Survey
02, 2007 17:10 PST
seems obvious even to a layman such as myself that the only
way to buy time is to use the most effective adelgicide in as
area as is possible. Yes, some organisms will suffer in the
but the long-term effects of the extinction of the eastern and
hemlock species equals the extinctions of those organisms that
exclusively to those trees.
I think of our hemlocks every day. Every single day. It sickens
depresses me to think that these trees, among which I have hiked
my life, will soon become extinct.
If it were possible to treat vast areas of hemlocks forests with
effective adelgicide, what are the long-term odds of the eastern
carolina hemlocks surviving an extinction event?