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Aphids often hide under leaves and near petioles, the stalks that attach leaves and stems.
Once established, scale insects can be difficult to control. Smother them with a solution of hortocultural oil. Indoor plants stay healthier if they're kept clean. So once a month, give them a shower with tepid water in your kitchen sink or bathtub. You'll remove dust, which can interfere with photosynthesis, and knock off certain insects.