Troubleshooting
Franchet Cotoneaster problems — and how to fix them
Franchet Cotoneaster (Cotoneaster franchetii) 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.
Fireblight
Bacterial disease causing shoots to die back as if scorched; prune to 30 cm below visible infection and sterilise tools with bleach solution between cuts.
Woolly aphid
White woolly masses on stems; brush off with a stiff brush and treat with systemic insecticide if severe.
Brown scale
Encrusts stems; treat with horticultural oil applied in late winter.
Invasive self-seeding
Bird-dispersed seeds spread readily in some regions; check local invasive plant lists before planting and consider removing berries before they fall.
Prevent franchet cotoneaster problems before they start
Most franchet cotoneaster issues are care-mismatch, not bad luck. Dial in the basics:
Franchet Cotoneaster problems — FAQ
Why is my franchet cotoneaster fireblight?
Bacterial disease causing shoots to die back as if scorched; prune to 30 cm below visible infection and sterilise tools with bleach solution between cuts.
Why is my franchet cotoneaster woolly aphid?
White woolly masses on stems; brush off with a stiff brush and treat with systemic insecticide if severe.
Why is my franchet cotoneaster brown scale?
Encrusts stems; treat with horticultural oil applied in late winter.
Why is my franchet cotoneaster invasive self-seeding?
Bird-dispersed seeds spread readily in some regions; check local invasive plant lists before planting and consider removing berries before they fall.