Flight interception trap

A flight interception trap is a widely used trapping, killing, and preserving system for flying insects. It is especially well-suited for collecting beetles, since these animals usually drop themselves after flying into an object, rather than flying upward. Flight Interception Traps are mainly used to collect flying species which are not likely to be attracted to bait or light.

Construction

The basis of any Flight Interception Trap consists of an upright placed see-through barrier under which one or more small basins are placed. The barrier may consist of such materials as plastic mesh, a transparent plastic sheet or even Plexiglas, although the latter does not work well for day-active insects since it is visible to them due to its specific refraction. The basins are filled with a preserving fluid such as ethanol, propylene glycol, salt-saturated water or even plain water. The best preservative to keep internal organs in good condition is FAACC, a solution of formaldehyde. A small amount of detergent is added to break the surface tension, causing the insects to sink.
Yellow pans with soapy water may be used alone. The water itself can be an attractant in dry environments .

Location

Depending on either the desired information or desired species the construction can be put in open land or in the forest. It is important to place the barrier in a straight angle with the most likely flying route for insects, so as to maximize results.

Checking

The basins can be checked daily, weekly or even less often. Maximum time between two checks depends on the used preservatives, since not all preservatives are equally suited for preserving insects for a longer time.

Cover

To prevent the basins from filling up with litter, most researchers place some kind of roof over the trap. This keeps leaves from falling in while it also keeps the rain out.