These whiteflies are tiny, heart-shaped flies that are generally no more than 1/10 inch long and if the infestation is serious, a cloud of whiteflies will suddenly go airborne like a burst of snow when a plant is bumped or moved. They can be found indoors and outdoors, but they are a bigger problem in greenhouses and on indoor houseplants because cold weather and natural predators tend to keep outdoor populations in check. They are piercing and sucking insects that can weaken a plant, though it's fairly rare for a plant to be actually killed.

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Source: The Spruce