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Another common pest, whiteflies suck a houseplant’s sap and cause the leaves to yellow and die. Because a large whitefly infestation will surely kill a plant and can infect others around it, you'll need to manually remove the insects by pulling, vacuuming, or hosing them off. Don't neglect the underside of each leaf, where the small winged insects lay their eggs. Finish up by applying a strong insecticidal soap to keep the pests from returning.
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