Yellow Sticky Insect Cards are used to trap thripThrip are tiny winged brown insects that feed on the surfaces of plant leaves, flowers, and buds. They leave silver spots around their feeding areas and dark dots of excrement. Thrip not only weaken plant growth and distort buds and flowers, they transmit viruses from plant to plant as they fly around. The Green Solution, Neem Oil, and Yellow Sticky Cards all are effective in eliminating thrip.s, whitefliesLearn how to identify and treat the plant pest called Whitefly at https://www.houseplant411.com/glossary/whitefly-plant-pests winged AphidsSee a picture, learn to identify, and read about Aphid houseplant pests in the Glossary of Houseplant411.com., and Fungus GnatsThis small dark skinny pest flies and jumps around plants and people driving us all crazy. Fungus Gnats develop in moist potting soil, feeding on root hairs and emerging as adults every 30 days. The best way to get rid of Fungus Gnats is to allow the soil to thoroughly dry out. This eliminates the eggs and gnats in the pot. Use yellow sticky cards to trap the Fungus Gnats that are flying around.. Place little pieces of the card inside the pot of the infested plant and near doors, vents, and windows. Stir the soil to encourage the pests to fly around and land on the cards. Change the sticky cards as their surface becomes covered with dead insects & other debris.