Sensor Yellow Pest Monitoring Cards are durable pest-monitoring and trapping cards designed to catch a variety of pests, such as thrips, whiteflies, fungus gnats, flies, leafhoppers, aphids, and other flying insects. It offers growers the best way to stop guesswork and evaluate whether insect control programs are working effectively. One can simply place one sensor card that can cover up to 500 square feet wherever flight occurs. Cards can also be placed in entry points, such as doors and vents. Has non-drip glue that will not stick to the skin. Its edges are also non-stick for easy handling. One pack contains 50 cards.