Troubleshooting
Stoneham Gold Western Red Cedar problems — and how to fix them
Stoneham Gold Western Red Cedar (Thuja plicata 'Stoneham Gold') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Phytophthora root rot
Foliage browns from the base up on waterlogged or poorly drained soils. Improve drainage before planting and avoid overwatering; no chemical cure once established.
Thuja blight (Didymascella thujina)
Causes brown, dead patches in the inner foliage, particularly in wet seasons. Improve air circulation, remove affected material, and apply a copper-based fungicide as a preventive in spring.
Bagworm (Thyridopteryx ephemeraeformis)
Spindle-shaped silk bags hanging on branches; larvae strip foliage. Remove bags by hand in winter and apply biological control (Bt) against young caterpillars in spring.
Prevent stoneham gold western red cedar problems before they start
Most stoneham gold western red cedar issues are care-mismatch, not bad luck. Dial in the basics:
Stoneham Gold Western Red Cedar problems — FAQ
Why is my stoneham gold western red cedar phytophthora root rot?
Foliage browns from the base up on waterlogged or poorly drained soils. Improve drainage before planting and avoid overwatering; no chemical cure once established.
Why is my stoneham gold western red cedar thuja blight (didymascella thujina)?
Causes brown, dead patches in the inner foliage, particularly in wet seasons. Improve air circulation, remove affected material, and apply a copper-based fungicide as a preventive in spring.
Why is my stoneham gold western red cedar bagworm (thyridopteryx ephemeraeformis)?
Spindle-shaped silk bags hanging on branches; larvae strip foliage. Remove bags by hand in winter and apply biological control (Bt) against young caterpillars in spring.