Catchmaster's 3 x 5 Inch Double-Sided Yellow Sticky Card Insect Traps reduce spending on pesticides while making your crops safer for the consumers and more profitable for you. Yellow sticky cards are most effective against aphids, whiteflies, thrips, and fungus gnats. They work by physically trapping pests on the card. No additional bait is needed. Waterproof and UV-resistant. Ideal for home gardens, greenhouses, hydroponic setups, and farms. Made in the USA.