How to Manage Pests

Pests in Gardens and Landscapes

Oak leaf phylloxera—Phylloxera spp.

Phylloxera are tiny yellow soft-bodied insects that feed in groups. They are oval and less than 0.10 inch long; a hand lens is required to see them.

Damage

Phylloxera suck sap from leaves. Leaves have many, tiny, irregular brown and yellow spots. Young plants are most susceptible.

Solutions

Plants are apparently not damaged. Tolerate leaf spots or apply soap thoroughly to leaf underside when nymphs are present, before severe spotting occurs. Natural enemies may help to control oak leaf phylloxera.

Oak leaf phyloxera
Oak leaf phylloxera

Spotted leaves due to phylloxera damage
Spotted leaves due to phylloxera damage


Statewide IPM Program, Agriculture and Natural Resources, University of California
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