Vegas roach trap
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The Vegas roach trap or Las Vegas roach trap refers to the serendipitous discovery, in Las Vegas, of a cockroach trap consisting of a jar, coffee grounds, and water, placed against a wall. Reported as extremely successful in eliminating cockroaches by Las Vegas local news and the KVBC bugcam, the homemade trap is made from any glass jar containing used coffee grounds and water. Placing the mouth of the jar next to the wall, the roaches are able to crawl up the wall and into the jar, to drown, or at least never escape since they are unable to climb the glass walls. Apparently, only cockroaches are attracted to it.
Note that while KVBC may have popularized this method of outdoor roach control, there are reports that a simpler variation (no water) has been used for years by other residents. A popular local Las Vegas message board message thread provides more detail with photo. An improved version (with photo) is also shown.
[edit] Construction
The trap is constructed from a canning or pickle jar partially filled with coffee grounds and water. It is usually placed against the outside wall of a house, giving cockroaches the opportunity to fall in. An alternative method involves covering the outside of the jar with scotch tape or packing tape in order to give sufficient traction for cockroaches to climb into the jar without the requirement of placement next to a wall.
The inner walls of the trap may be smeared with petroleum jelly to prevent the cockroaches escape.[1]
