How to Manage Pests

Pests in Gardens and Landscapes

Arborvitae—Platycladus orientalis, Thuja occidentalis
Western red cedar—Thuja plicata
Family Cupressaceae (Cypress family)

Plant Identification

Arborvitaes are evergreen trees or shrubs, often shaped into cones or cylinders.  Leaves are yellowish green and needlelike.  Younger leaves are soft and feathery, while older leaves are more scalelike.  Arborvitaes produce small bluish green cones that turn a brownish color.

Optimum conditions for growth

Arborvitaes are often grown along walkways as hedges.  They grow well in areas with full sun but need partial shade in very hot climates.  Arborvitaes need regular or moderate amounts of water and do best in well-drained soils.   

Foliage of western red cedar
Needlelike leaves of western red cedar

Pests and disorders of Platycladus and Thuja spp.



Environmental disorders



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