Great ‘no-spray’ way to stop aphid, whitefly, leafminer, thrip and fungus gnat damage! Just trap ’em! Each adhesive card is an effective, non-toxic trap used for monitoring and trapping pests. Use the bright yellow color for aphids, whiteflies, leafminers, fungus gnats, or thrips (call/available upon request). However, for more effective thrip control, we recommend the blue color. Heavyweight waterproof paper with peel-off sheets. Pack of 25 traps, each is 5 inches x 8 inches.