Yellow sticky traps will catch plenty of small pest insects such as aphids, white flies and fungus gnats. Yellow sticky traps are small plastic strips coated with a sticky material. Safe and non-toxic, they last all season, even through water exposure. However, you should use sticky traps for only 3 to 4 weeks; any longer and they'll trap beneficial insects as well.They are sold in garden centers and plant shops to control various insect pests. When inserted in the soil or hung on a plant that is continually troubled by aphid or whitefly attack, they attract the little pests and kill them. Place the traps next to (not above) susceptible plants.

Make Your Own Sticky Traps - Obtain some panels of a material such as Masoniteä (10 inch by 10 inch squares) and paint them bright yellow (school-bus-yellow, or Rust-Oleum No. 659 or Sunset Yellow No. 7745), then coat the painted panels with a weatherproof adhesive pest product such as Tack Trap, Tanglefoot, motor oil, or petroleum jelly. Then place the traps next to (not above) susceptible plants.