Small sap-sucking insects. Mealy bugs are tiny, but easily seen, flattened and slow-moving, with a whitish water-repellent coating like flour dusted over cobwebby hairs. They hide on the underside of leaves, among sheathing leaf bases, and among plant roots. They thrive on indoor plants and are difficult to eradicate.
A cotton swab dipped in alcohol will remove small infestations. Alcohol diluted 1 part alcohol to 3 parts water can be used in a spray bottle for heavy infestations. Make sure the plant leaves won't burn from the alcohol. Also don't have the plants in the sun when you spray them. Neem oil spray also works on large infestations.