Troubleshooting
Dwarf Golden Oriental Arborvitae problems — and how to fix them
Dwarf Golden Oriental Arborvitae (Platycladus orientalis 'Aurea Nana') is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Bagworm (Thyridopteryx ephemeraeformis)
Bagworms construct distinctive 3–5 cm spindle-shaped silk bags camouflaged with foliage fragments; heavy infestations defoliate and kill branches. Hand-pick and destroy bags in winter; treat active larvae in late spring with Bacillus thuringiensis (Bt) or spinosad.
Phytophthora root rot
Waterlogged soil triggers this oomycete pathogen, causing foliage to turn brown from the base upward and the bark at the soil line to show reddish-brown discolouration. There is no cure once established; prevention through sharp drainage is essential.
Prevent dwarf golden oriental arborvitae problems before they start
Most dwarf golden oriental arborvitae issues are care-mismatch, not bad luck. Dial in the basics:
Dwarf Golden Oriental Arborvitae problems — FAQ
Why is my dwarf golden oriental arborvitae bagworm (thyridopteryx ephemeraeformis)?
Bagworms construct distinctive 3–5 cm spindle-shaped silk bags camouflaged with foliage fragments; heavy infestations defoliate and kill branches. Hand-pick and destroy bags in winter; treat active larvae in late spring with Bacillus thuringiensis (Bt) or spinosad.
Why is my dwarf golden oriental arborvitae phytophthora root rot?
Waterlogged soil triggers this oomycete pathogen, causing foliage to turn brown from the base upward and the bark at the soil line to show reddish-brown discolouration. There is no cure once established; prevention through sharp drainage is essential.