Troubleshooting
Weeping European Larch problems — and how to fix them
Weeping European Larch (Larix decidua 'Pendula') 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.
Larch case bearer
Small moths whose larvae mine needles in late spring. Treat with insecticide in early summer if infestations are severe.
Larch canker (Lachnellula willkommii)
Fungal cankers cause branch dieback. Prune and destroy affected material; avoid wounding the bark.
Adelgids
Woolly sucking insects can colonise shoots. Treat with horticultural oil or systemic insecticide.
Root rot in wet soils
Extended waterlogging causes root decline. Ensure good drainage before planting.
Graft failure
The weeping form is always grafted; inspect the graft union annually for signs of splitting or incompatibility.
Prevent weeping european larch problems before they start
Most weeping european larch issues are care-mismatch, not bad luck. Dial in the basics:
Weeping European Larch problems — FAQ
Why is my weeping european larch larch case bearer?
Small moths whose larvae mine needles in late spring. Treat with insecticide in early summer if infestations are severe.
Why is my weeping european larch larch canker (lachnellula willkommii)?
Fungal cankers cause branch dieback. Prune and destroy affected material; avoid wounding the bark.
Why is my weeping european larch adelgids?
Woolly sucking insects can colonise shoots. Treat with horticultural oil or systemic insecticide.
Why is my weeping european larch root rot in wet soils?
Extended waterlogging causes root decline. Ensure good drainage before planting.
Why is my weeping european larch graft failure?
The weeping form is always grafted; inspect the graft union annually for signs of splitting or incompatibility.