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Houseplants are susceptible to attack by many insects and mite pests. Some of these houseplant pests can cause extensive damage to the appearance and health of the plant while others are simply a nuisance. Plants that are not vigorously growing and/or are under stress may be particularly susceptible to insect and mite injuries.
Infestations of scale insects (mealybugs and whiteflies) are almost always established from infested plants recently purchased or received as gifts. As a precaution, all new plants should not be placed with existing houseplants for at least three weeks. A careful inspection at the end of this time helps determine the presence or absence of pests.
Methods Used to Control Houseplant Pests Syringing plants. Many household plant pests can be controlled, at least in part, by washing the plant periodically with a vigorous jet of water. This is particularly effective for spider mites and aphids, which are most readily dislodged. Cultural changes. Watering affects houseplant pests in a couple of different ways. Excessively moist soil favors the development of problems with fungus gnats. However, plants placed in very hot, dry sites are prone to problems with spider mites. Handpicking. Larger houseplant insects can be controlled by handpicking. This is especially useful for scale insects and mealybugs. Regularly using small, hand-held vacuums assist in controlling whiteflies
