Pan trap

[1] Pan traps are typically constructed with a bowl with shallow sides filled with water and soap or a preservative and killing agent.

[3] A pan trap consists of a shallow bowl, typically made of colored plastic, filled with soapy water, salt, propylene glycol, antifreeze, or combinations of other preservatives and killing agents.

Salt and propylene glycol are sometimes included as preservatives or to reduce evaporative water loss.

Some traps have been mounted on trees to sample the communities of parasitoid wasps of the invasive beetle, Emerald ash borer.

[3][6] However, yellow and white pan traps consistently collect the largest number of species.