UV light traps - how far above the ground?

Eric or Pat Metzler spruance at infinet.com
Mon Jan 29 21:47:50 EST 2001

You'll get as many answers as there are people reading this list.
The real answer to this question is already in the scientific literature.  I
don't have the references in front of me, but the answer is know by
experimental design.  You can go the library and look it up.  No need to
The answer is not how many moths you get, but the different species that fly
in different locations, just like by moving the trap from one habitat to
So don't worry about the numbers.  It's the variety that makes a difference.
Cheers to all from Columbus OH where it is too cold to use traps right now.
Eric Metzler
<Leptraps at aol.com> wrote in message news:93.6314be2.27a7493b at aol.com...
> I think I can add a little to this discussion.
> I have been using traps, both light and bait for many years. Here are a
> suggestions.
> Light traps will work whether up in a tree or on the ground. However, if
> are placed on the ground and surrounded by vegetation, the light will be
> blocked limiting the effect of the trap. I have hung em high and hung em
> Keep them in a cleared area, whether on the ground, on a stand, or in a
> When I trap in a prairie the light trap is raised to provide better
> reach/distance for the light. I use metal stands 28" tall. Wind on a
> will below the ethyl acetate out of the trap causing a poor kill and
> damage to the specimens. I baffle my traps in the pail to reduce the
> of the wind. It will also help if the ethyl acetate containers are near
> top of the trap. Ethyl acetate is heavier than air and will disperse more
> evenly when raised to the top of the pail (Behind the funnel is the best
> location).
> Raising a trap into a tree will general not increase the total number of
> insects that will be drawn to the light, it will however, on occasions,
> increase the number of species of moths and you will also take more
> (I have no real explanation for this phenomena). Wind has a far greater
> effect on a trap hung up in a tree. Beside the effect of the wind on the
> ethyl acetate, the trap will spin and sway. Even when well tethered.
> storms with high wind can knock the trap out of the tree. Also, make a
> flapper for the exit of the rain drain when you suspend them. This
> wind from passing through the trap from the bottom. This will draw out the
> ethyl acetate much more rapidly than from the top.
> You may also try a "Black Light Black" bulb (Dark purple). You will
> different species due to a different UV light pattern. HomeDepot currently
> has the dark bulbs for $9.99. This is a real bargain. The last ones I
> purchased were in excess of $29.00 per bulb.
> I should write a book on this subject!
> Cheers,
> Leroy C. Koehn
> 202 Redding Road
> Georgetown, KY  40324
> Tele.: 502-570-9123
> Cell: 502-803-5422
> E-mail: Leptraps at aol.com
> "Let's get among em"
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