Some day-flying insects are attracted to specific colors. Colored traps can be coated with a sticky substance to capture these insects. Some visual traps that can provide partial control of insects when properly used include red sticky balls for apple maggot, yellow sticky cards for aphids and whiteflies, and white cards for plant bugs. In addition, some visual traps are enhanced with chemical lures. Chemical Lures or Bait Traps Pheromones are a well-known type of chemical lure.
Pheromone traps utilize a sex attractant for the pest species.
They are excellent monitoring devices, and several have been shown to provide control of certain species such as codling moth. Aggregation pheromones are used in traps to collect elm bark beetles. Feeding attractants are also used to trap insects. The effectiveness of the Japanese beetle trap as a control method continues to be investigated, and it is likely that they can protect small garden areas from too much damage if properly placed. Improper placement, however, can attract more hungry beetles to the garden area.