A trap for insects, particularly for wasps, comprises a vapour chamber having at least one insect entrance defined in a wall of the vapour chamber, and a bait or collection chamber couplable to the vapour chamber at a restriction. The restriction is sized to control the movement of insects between these two chambers. In operation, attractant vapour from a bait source accumulates in the vapour chamber and is released through the entrance. Insects attracted by the attractant vapour enter the vapour chamber and are maintained in flight within it, the restriction delaying their entry into the collection chamber. Once tired, insects drop down into the collection chamber where, in a preferred embodiment, they are immersed in a fluid and drowned.
