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From: Richard Magill <rmagill9_at_netscape.net>
subject: [Paddlewise] Mosquito's
Date: Mon, 21 Jul 2003 23:42:25 -0400
Has anyone tried these new ultrasonic mosquito repellants?  Do they 
work, and if so, how do they hold up around salt water?
-- 
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From: PeterO <rebyl_kayak_at_iprimus.com.au>
subject: RE: [Paddlewise] Mosquito's
Date: Tue, 22 Jul 2003 23:18:26 +1000
Richard wrote
>Has anyone tried these new ultrasonic mosquito repellants?  Do they
>work, and if so, how do they hold up around salt water?
--

G'Day,

My vitriolic hatred of mossies led me to invest in such a device, against my
better judgement. Yet another investment down the drain, at least as far as
Ozzie mozzies are
cerned:~( 

Much sympathy and all the best, PeterO
(Australia)


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From: Bob Denton <bdenton_at_soytek.com>
subject: RE: [Paddlewise] Mosquito's
Date: Tue, 22 Jul 2003 09:59:55 -0400
The vibrator is supposed to mimic the vibrations of a dragon fly's
wings. A mosquito's natural enemy. Here in Florida they are called
mosquito hawks. The concept may work if the mosquitoes have adapted to
an aversion to those specific vibrations.

cu
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From: James <jimtibensky_at_fastmail.fm>
subject: RE: [Paddlewise] Mosquito's
Date: Wed, 23 Jul 2003 09:29:45 -0500
Bob Denton said:  The vibrator is supposed to mimic the vibrations of a
dragon fly's wings. A mosquito's natural enemy. Here in Florida they are
called mosquito hawks. The concept may work if the mosquitoes have
adapted to an aversion to those specific vibrations.


Question:  How does the mosquito evolve to have the behavior of avoiding
a sound that precedes their death?  I believe that mosquitos do not
communicate information to each other, along the lines of "And another
thing, kiddies, if you hear a buzzing sound - duck!"  So the behavior
would have to evolve by increased survival of mosquitos who recognized
the sound as indicating danger, avoided the danger, and lived to
reproduce.  I'm not saying it couldn't happen, but is there someone more
familiar with evolution than this old anthropology major who does know?

Jim Tibensky
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From: Bob Denton <bdenton_at_soytek.com>
subject: RE: [Paddlewise] Mosquito's
Date: Wed, 23 Jul 2003 10:47:44 -0400
Similar to the process of developing resistance to pesticides. Thus, if
a particular pesticide is not used in a certain area, there would be no
innate resistance. One would assume that there would be some form of
selection against natural predators. At times in the Everglades the air
is thick with dragon flies. I assume that Florida mosquitoes may be more
attune to the specific frequencies that other parts of the country where
there are fewer dragon flies. In addition, I have no idea IF there is a
specific frequency for their wing beats.  Personally, I wouldn't spend a
dime on one of these, unless I could use the battery for something.

Cya



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From: Gordon Dietzman <gdietzman_at_visi.com>
subject: RE: [Paddlewise] Mosquito's
Date: Wed, 23 Jul 2003 10:58:17 -0500
Question:  How does the mosquito evolve to have the behavior of avoiding
a sound that precedes their death?  I believe that mosquitos do not
communicate information to each other, along the lines of "And another
thing, kiddies, if you hear a buzzing sound - duck!"  So the behavior
would have to evolve by increased survival of mosquitos who recognized
the sound as indicating danger, avoided the danger, and lived to
reproduce.  I'm not saying it couldn't happen, but is there someone more
familiar with evolution than this old anthropology major who does know?

Jim Tibensky


Jim and everyone,

I'm somewhat of a lurker on this forum, this is my first post, and although
I've paddled extensively in wilderness areas, I don't consider myself an
expert canoer...more of an experienced wilderness camper that uses a canoe
to get around...but I've certainly enjoyed the discussions. Anyway, maybe I
can contribute a bit of info here, or at least a smile...

I cannot vouch for what mosquitoes can and cannot hear, but I can offer a
possible semi-answer to Jim's question that at least some insects do detect
certain frequencies including those of potential predators and that there
appears to be an instinctive avoidance reaction. For instance, some species
of moths react to the echolocation frequencies used by bats, one of their
primary predators, by folding their wings and dropping into grass or
shrubbery where the bats refuse to go.  Bats can get a hard return off moths
from a distance of about 10-15 feet or so, but moths can detect the bats'
echolocation clicks at considerably greater distances, so their avoidance
behavior works quite well.

To illustrate, one evening my newly-wedded wife was unsuccessfully chasing a
moth through the house, but she couldn't catch it.  I, being a naturalist
and knowing such inherently usable tidbits, such as facets of moth behavior,
slyly pulled a set of keys from my pocket and jingled them gently while
commanding the moth to immediately land.  The moth, detecting the
frequencies of an echolocating bat among the wide range of frequencies
emanating from the jingling keys, folded its wings and fell onto the carpet,
whereupon I simply reached down and picked it up, much to the amazement of
my wife!  I have since been her hero and she has been my best canoeing
buddy...grin.

Not all species of moths use this defense, but certainly several do.

As to mosquitoes, we simply bear their existence when they are infrequent,
use a bit of Skin-so-Soft or citronella based repellant when they are a bit
more common, or DEET when they are swarming.  A friend used a $9.00
frequency generator repeller on a trip to the Boundary Waters, but we could
have sold him a bottle of Cutters for $20 the first night.

Gordon Dietzman
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From: <cholst_at_bitstream.net>
subject: Re: [Paddlewise] Mosquito's
Date: Tue, 22 Jul 2003 08:40:07 -0500
Quoting Richard Magill <rmagill9_at_netscape.net>:

> Has anyone tried these new ultrasonic mosquito repellants?  Do they 
> work, and if so, how do they hold up around salt water?
> -- 


Everything I've heard says they don't work. DEET is the only tried and true 
mosquito repellant, though I read somewhere that there might be a new repellant 
under development that is almost as good. Sorry, I can't remember the name of 
the chemical, but I think a search on Google might produce several good hits.

Chuck Holst
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From: Bob Denton <bdenton_at_soytek.com>
subject: RE: [Paddlewise] Mosquito's
Date: Tue, 22 Jul 2003 10:16:46 -0400
We have just developed an all natural mosquito repellent which has
recently been tested in Northern Minnesota and the Mangroves and appears
to out perform Deet.  Mosquitoes follow the CO2 plume exhaled by all
mammals, then use the octinol scent exuded by mammalian skin to find a
blood source.  

Repellents don't repel, but simply mask. One problem in testing
repellents, is that each species of mosquito responds differently to
"repellents" but only one species can be bred in the lab for testing
purposes..Ades Egypti. It's one of the vectors for malaria and yellow
fever, so it makes for a viable study, but other repellents have been
shown to be up to 10 times more effective against other species in South
East Asia. Our bug lab suggested the best test for our product would be
field trials under actual conditions.

Cya!

Bob Denton
www.soytek.com


>>>Everything I've heard says they don't work. DEET is the only tried
and true mosquito repellant, 
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From: Patrick Maun <patrick_at_patrickmaun.com>
subject: Re: [Paddlewise] Mosquito's
Date: Tue, 22 Jul 2003 14:18:52 -0400
I know people who've had severe reactions to DEET and I for one hate 
getting into my sleeping bag covered in any chemical. So a few years 
ago I switched to using a bug shirt. 

I have one from The Original Bug Shirt Company 
(http://www.bugshirt.com/) which is, I believe, far better than any I've 
seen.

There is nothing nicer for avoiding *all* bugs. The quality is great and 
the egyptian cotton portions are cool in the summer. Bring a pair of light 
cotton gardening gloves and you've got total protection. 

A few weeks ago a group of five of us were in Voyageurs National Park 
(home of one or two mosquito's and black flies) and we all had bug 
shirts on. We looked like a outdoors loving cult.

I am going to Vietnam and Cambodia for a month this coming January 
and I'll definately be bring the bug shirt.

-Patrick

On Tue, 22 Jul 2003 08:40:07 -0500, cholst wrote

> Everything I've heard says they don't work. DEET is the only tried 
> and true mosquito repellant, though I read somewhere that there 
> might be a new repellant under development that is almost as good. 
> Sorry, I can't remember the name of the chemical, but I think a 
> search on Google might produce several good hits.
> 
> Chuck Holst



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From: Steve Holtzman <sh_at_actglobal.net>
subject: Re: [Paddlewise] Mosquito's
Date: Tue, 22 Jul 2003 07:06:16 -0700
----- Original Message ----- 
Everything I've heard says they don't work. DEET is the only tried and true
mosquito repellant, though I read somewhere that there might be a new
repellant
under development that is almost as good. Sorry, I can't remember the name
of
the chemical, but I think a search on Google might produce several good
hits.

Chuck Holst
***************************************************************************

Since my wife and I are travelling to a Malaria and Yellow Fever area next
month, I've been doing some research about preventing mosquito bites.

The CDC recoomends that repellent containing DEET be applied to all exposed
skin areas.

Steve Holtzman
Southern, CA

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From: <mcguire_at_cs.utexas.edu>
subject: Re: [Paddlewise] Mosquito's
Date: Tue, 22 Jul 2003 11:05:21 -0500
We've had some success in this area with surplus Phalanx close-in
weapons systems (a 20mm radar-controlled gatling doodad).  Although some
of the skeeters have been resistant to individual rounds, the impact
usually knocks them into someone else's back yard.

<Rick.Sylvia_at_ferguson.com> wrote:
 >Similar to duck hunting, we'll take a few male mosquitoes down with
 >some buckshot and have the dogs retrieve them.  Once we get them home,
 >we'll tie some rope to their legs and hang them upside down from the
 >trees.  When the other mosquitoes see that carnage, they usually move
 >on.


Tommy McGuire
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