Most glue boards lose their tackiness when wet.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/99758165@N06">NY State IPM Program  at Cornell University</a> from New York, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/99758165@N06/10157244563/">Replace Old Glue Traps</a>