How to Manage Pests

Pests in Gardens and Landscapes

Filbert, California Hazel, Hazelnut—Corylus spp.
Family Betulaceae (Birch family)

Plant Identification

Corylus spp. are deciduous shrubs and trees.  Leaves are round or oval with toothed margins.  Plants have both female and male flowers.  Female flowers are inconspicuous.  Male flowers are more apparent and develop in long cylindrical clusters.  Suckers tend to develop from the base of plants.

Optimum conditions for growth

Filberts do well in areas with full sun or partial shade.  Remove suckers and water regularly.  Thin branches in late winter as needed.

Leaf of Contorted filberr
Leaf of contorted filbert

Pests and disorders of Corylus spp.



Environmental disorders



Contorted filbert
Harry Lauder's Walking Stick (Contorted filbert)

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