Managing Pests in Gardens: Trees and Shrubs: Oak

Pests in Gardens and Landscapes

Oak—Quercus spp. Tanbark oak—Lithocarpus densiflorus

Plant Identification

Oaks are deciduous or evergreen trees with acorns.

Optimum conditions for growth

Oaks grow in various climatic zones and do well in full sun.

Oak leaves
Leaves of valley oak

Fall color of pin oak

Pests and disorders of *Quercus* spp. and *Lithocarpus* spp.
Invertebrates Acorn moth Aphids Armored scales Obscure scale Bark beetles Ambrosia beetles Oak bark beetles Carpenterworm Clearwing moth borers Sycamore borer Filbertworm, filbert weevil, and acorn moth Flatheaded borers Flatheaded appletree borer Oak twig girdler Pacific flatheaded borer Foliage-feeding caterpillars California oakworm Fruittree leafroller Tent caterpillars Tussock moths Foliage miners Leafminers Oak ribbed casemaker Shield bearers Skeletonizers Fuller rose beetle and Live oak weevil Gall and blister mites Live oak erineum mite Gall makers California gallfly Cynipid gall wasps Ichneumonid wasps Jumping oak gall wasp Twohorned oak gall wasp Glassy-winged sharpshooter Mealybugs Obscure mealybug Oak leaf phylloxera Pit scales Ehrhorn's oak scale Oak pit scale Root nematodes	Invertebrates (cont.) Roundheaded borers Roundheaded oak twig borer Soft scales Kermes scales, black-punctured kermes Oak lecanium scale Spider mites Sycamore spider mite Treehoppers Oak treehopper Whiteflies Crown whitefly Gelatinous whitefly Stanford whitefly Woolly aphids Woolly oak aphid Diseases Anthracnose Armillaria root rot Canker diseases Hypoxylon canker Nectria canker Drippy oak acorns Foamy canker Oak branch dieback Oak leaf blister Oak twig blight Powdery mildew/Witches' broom Root and crown rots Rusts Sudden oak death Wetwood Wood decay Environmental disorders Leaf burn Leaf scorch Mineral deficiencies Iron deficiency Nutrient and mineral excesses Poor water management Sunburn Parasitic plants Broadleaf mistletoe Weeds Vertebrates

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How to Manage Pests

Pests in Gardens and Landscapes

Oak—Quercus spp. Tanbark oak—Lithocarpus densiflorus

Plant Identification

Optimum conditions for growth

Invertebrates

Invertebrates (cont.)

Diseases

Environmental disorders

Parasitic plants

Weeds

Vertebrates