The chemical free way to both control pests, and monitor their populations. The idea is used widely in peofessional growing, insects can't resist the lure of bright yellow, and as they land on it the sticky glue sticks them to the surface. The traps are square-gridded, so you can easily count how many are rapped and see if populatiosn are rising. use in greenhouses, or conservatories where insects ar active. Suitabel for Organic systems.