Whiteflies can be found indoors and outdoors, but they are a bigger problem in greenhouses and on indoor houseplants because cold weather tends to keep outdoor populations in check. The infestation can quickly spiral out of control, so it's best to treat whiteflies at the first signs of infestation. Like most pests, the best control for whiteflies is a strong defense. Healthy, vigorous plants are less susceptible to infestation than weak, underpotted, and stressed plants. As a general rule, make sure your plants are healthy and they'll be less susceptible to an infestation.

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Source: The Spruce