What Are Tiny White Bugs on Plants?

Whiteflies are the tiny bugs that feed on the undersides of plant leaves. These insects suck the sap from plants and can go unnoticed until the damage to leaves becomes visible, usually appearing speckled. Whiteflies have the ability to spread disease and pose a serious risk to crop production around the world. For houseplants, spraying infested leaves with plain white vinegar appears to be an effective tool in getting rid of a whitefly infestation.