Phlloxera are tiny, yellowish insects that suck sap from the underside of leaves, particularly on oak species, producing tiny, irregular brown and yellow spots. Damage is primarily aesthetic and is not serious. Either tolerate this pest or apply insecticidal soap to the Underside of affected leaves before they become severely spotted.
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Missouri Botanical Garden
4344 Shaw Blvd., St. Louis, MO 63110(314) 577-5100 hours and admission
Butterfly House
Faust Park, 15193 Olive Blvd. Chesterfield, MO 63017(314) 577-0888 hours and admission
Shaw Nature Reserve
307 Pinetum Loop Rd, Gray Summit, MO 63039(314) 577-9555 hours and admission