Pheromone trap is used for capturing

Pheromone trap is used for capturing adult males.
A pheromone trap is a type of insect trap that uses pheromones to lure insects. Sex pheromones and aggregating pheromones are the most common types used.
Pheromone traps capture male moths and are used to monitor when the moth flight starts and its population dynamics. Pheromone traps use chemical signals (pheromones) emitted by females to attract a mate (therefore pheromone traps only catch males of that species).