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How to Manage Pests

Pests in Gardens and Landscapes

Flagging on arborvitae or western red cedar

Foliage at the base of branches throughout the canopy turns brown, typically during summer or fall. Needles may drop prematurely. Flagging on arborvitae or western red cedar may be caused by several factors, including injury to roots, drought, and hot weather. Trees usually recover in spring.

Solutions

Protect trees from injury. Avoid disturbing the soil around the roots. Provide adequate irrigation during prolonged drought.

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