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Home > Archive > Pest Control > July 2005 > How long does permethrin last?
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How long does permethrin last?
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| I've been spraying for bed bugs, using water dilution of "insectrin X"
permethrin and concentrations between .3 and .6 %. (Gentrol was mixed
in, too.)
How long does permethrin last:
1) on carpet
2) on unpainted wood.
3) on painted (latex) wood.
4) on painted drywall
5) on bare metal?
I spray fairly liberally.
So far I've sprayed the box frame inside and out and edges of mattress
(twice), creases and seams of sofa, floor around sofa and bedroom floor
and closet, each time airing out for several hours with external air
blowns through the sprayed area.
The bites seem to have stopped for the last 2 weeks.
(Note that I'm in new construction, no real cracks or crevices around for
dusting.)
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| In article <pan.2005.07.15.13.07.35.847539@nowhere.com>,
none@nowhere.com says...
 I've been spraying for bed bugs, using water dilution of "insectrin X"
permethrin and concentrations between .3 and .6 %. (Gentrol was mixed
in, too.)
Is it labeled for indoor use? I couldn't come across a label but
everything I saw dealt with farm animal treatments and .3%-.6% sounds a
bit high in the strength.
How long does permethrin last:
depends on the formulation strength and environment it's placed in.
1) on carpet
I would think it would last up to a week
2) on unpainted wood.
more of a contact kill
3) on painted (latex) wood.
up to a week (still guessing)
4) on painted drywall
same as above
5) on bare metal?
not very long
I spray fairly liberally.
So far I've sprayed the box frame inside and out and edges of mattress
(twice), creases and seams of sofa, floor around sofa and bedroom floor
and closet, each time airing out for several hours with external air
blowns through the sprayed area.
The bites seem to have stopped for the last 2 weeks.
(Note that I'm in new construction, no real cracks or crevices around for
dusting.)
--
Lar
to email....get rid of the BUGS
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| U. Lachmuth 2005-07-15, 6:25 pm |
|
Hi,
quote:
> I've been spraying for bed bugs, using water dilution of "insectrin X"
> permethrin and concentrations between .3 and .6 %. (Gentrol was mixed
> in, too.)
Good luck, the bedbugs I've seen over the past two years were not very
impressed by permethrin. Concentrationwise hereabouts (Europe) 0.25% are
normal in RTU formulations, concentrate labels instruct to dilute to
that value
quote:
> How long does permethrin last:
Being a synthetic pyrethroid optimised for longevity it is degraded
mainly by light and rF, wherever you spray it. Normal life span for the
a.i. is 6 to 12 weeks, can be (considerably) more when absorbed.
Your question seems to be directed more toward bioavaialbilty, here
Lar's statement can be generally ACK'd, bearing in mind that you are up
against a pest moving on the surface (not below)
quote:
> 1) on carpet
crawling insects: days rather than weeks. Textile pests weeks to months
quote:
> 2) on unpainted wood.
crawling insects: just about 2 weeks, I'd say. When used as a wood
preservative (injected), permethrin will last for several years
quote:
> 3) on painted (latex) wood.
weeks
quote:
> 4) on painted drywall
depends on the paint. days to months
quote:
> 5) on bare metal?
long. up to 3 months
quote:
> I spray fairly liberally.
The amount of a.i. does not relate to the average rate of degradation
All answers are under the assumption that treates surfaces are not wiped
or cleaned - if they are, the better part of what you applied will be
physically removed (rendering the a.i. unavailable to your target,
although it might be still very active)
Cheers, Uli
--
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| In article <db8s2k$nf4$1@news.hispeed.ch>, squonk@bluemail.ch says...
The amount of a.i. does not relate to the average rate of degradation
All answers are under the assumption that treates surfaces are not wiped
or cleaned - if they are, the better part of what you applied will be
physically removed (rendering the a.i. unavailable to your target,
although it might be still very active)
Looking again I see I could of worded my answer better ...I was
considering the effectiveness of the permethrin product as a whole
rather than just the active ingredient. Bob, with the formulation
Insectrin X being an Emulsified Concentrate it will not be an effective
tool on unpainted surfaces and metal for much time, though as Uli points
out the actual Permethrin can still be detected and active for a long
period of time, just not where your target pest problem may be solved.
--
Lar
to email....get rid of the BUGS
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| bugs@bugs.com 2005-07-16, 4:25 am |
| Uli just like a bedbug you stick your head out of the crack and let us know
you are still around on occasions. It is good to see you my friend. Come
join us on the askourpros board if you get a chance.
--
I wish you all the best
Tim Wise
www.onepest.com
www.askourpros.com
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| On Fri, 15 Jul 2005 08:48:21 -0500, Lar wrote:
quote:
> Is it labeled for indoor use? I couldn't come across a label but
> everything I saw dealt with farm animal treatments and .3%-.6% sounds a
> bit high in the strength.
For farm animal treatment, it's applied directly to the animals. The
label specifies concentrations from 0.1 to 0.5 % for surface usage.
Yes it's specified for indoor usage.
(Interestingly enough, there is 1.0% permethrin shampoo used for head lice
and 5.0% permethrin cream used for scabies. Thankfully I've never had to
try these.)
I've also found products made by Sawyer, for the clothes of those trekking
in the woods, to kill/repel ticks and such. These are 0.5 % - the aerosol
(nasty "inert ingredients) is stated to last 6 weeks (or 6 launderings)
and the spray on (presumably water based emulsified) is good for 2 weeks
(or 2 washings). These are applied until the clothing is damp, then
allowed to dry.
quote:
> How long does permethrin last:
> depends on the formulation strength and environment it's placed in.
>
> 1) on carpet
> I would think it would last up to a week
>
> 2) on unpainted wood.
> more of a contact kill
>
> 3) on painted (latex) wood.
> up to a week (still guessing)
>
> 4) on painted drywall
> same as above
>
> 5) on bare metal?
> not very long
>
> I spray fairly liberally.
>
> So far I've sprayed the box frame inside and out and edges of
> :mattress ) (twice), creases and seams of sofa, floor around sofa and
> :bedroom floor ) and closet, each time airing out for several hours
> :with external air ) blowns through the sprayed area. ) ) The bites
> :seem to have stopped for the last 2 weeks. ) ) (Note that I'm in new
> :construction, no real cracks or crevices around for ) dusting.) )
>
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| On Fri, 15 Jul 2005 19:34:25 +0200, U. Lachmuth wrote:
quote:
>
>
>
> Good luck, the bedbugs I've seen over the past two years were not very
> impressed by permethrin. Concentrationwise hereabouts (Europe) 0.25% are
> normal in RTU formulations, concentrate labels instruct to dilute to
> that value
>
If they're permethrin-resistant, what's the next in line to use?
quote:
> Being a synthetic pyrethroid optimised for longevity it is degraded
> mainly by light and rF, wherever you spray it. Normal life span for the
> a.i. is 6 to 12 weeks, can be (considerably) more when absorbed.
what is "rF"?
quote:
>
> crawling insects: days rather than weeks. Textile pests weeks to months
A week later, bed bugs could crawl across it and not be killed?
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| PCOpug 2005-07-16, 4:25 am |
| If they're permethrin-resistant, what's the next in line to use?
Deltamethrin .
(Good old microencap Dursban or Diazanon would have taken care of em' in the
"Old Days".)
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| U. Lachmuth 2005-07-16, 6:26 pm |
| bugs@bugs.com schrieb:
quote:
> Uli just like a bedbug you stick your head out of the crack and let us know
> you are still around on occasions. It is good to see you my friend. Come
> join us on the askourpros board if you get a chance.
Have been there quite some time in fact - I'm not really into discussing
termites or trucks ;) - neither are really "on topic" in Pest Control in
Switzerland.
But, I'm still alive & kickin' - whenever I come across a topic where I
may contribute I will.
Cheers, Uli
--
Antworten bitte an: pco<AT>gmx<DOT>net oder in der NG
reply to pco<AT>gmx<DOT>net or to the ng, please
SQUONK is a spam trap - Sorry for the inconvenience!
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| U. Lachmuth 2005-07-16, 6:26 pm |
| bob wrote:
quote:
> If they're permethrin-resistant, what's the next in line to use?
We had some very encouraging results with d-phenothrin
quote:
> what is "rF"?
German, I'm afaraid. rH in english, relative humidity
quote:
> A week later, bed bugs could crawl across it and not be killed?
Yep. Permethrin is a liquid, so is an emision. When treating tectiles,
the prep will soak into the fabric, leaving only little if any residue
on the surface where the BB are. So you might end up in a situation
where there's still plenty of active permethrin around, only
unfortunately in an area where the BB can't get at it.
Cheers, Uli
--
Antworten bitte an: pco<AT>gmx<DOT>net oder in der NG
reply to pco<AT>gmx<DOT>net or to the ng, please
SQUONK is a spam trap - Sorry for the inconvenience!
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| U. Lachmuth 2005-07-16, 6:26 pm |
| bob wrote:
quote:
> If they're permethrin-resistant, what's the next in line to use?
we had some very encouraging results with d-phenothrin
quote:
> what is "rF"?
German, I'm afraid. rh in english, relative humidity
quote:
> A week later, bed bugs could crawl across it and not be killed?
Yep. Permethrin is a liquid, so is an emulsion. When treating texiles,
the prep soaks into the fabric, leaving little if any residue of the
surface where the BB travel. You might end up in a situation where
there's still plenty of active permethrin but some 5 mm underneath the
bed bugs - permethrin is fairly strong, but no distance weapon ;)
Cheers, Uli
--
Antworten bitte an: pco<AT>gmx<DOT>net oder in der NG
reply to pco<AT>gmx<DOT>net or to the ng, please
SQUONK is a spam trap - Sorry for the inconvenience!
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