Pest identification
What's eating my interrupted fern?
Scale insects
Signs: Bumps on stipe bases and frond midribs; yellowing fronds and sticky honeydew on lower surfaces.
Control: Scrub off with a soft brush dampened with soapy water; apply horticultural oil spray and repeat every 10 days for a month.
Spider mites
Signs: Fine bronzing and speckling across frond surfaces; webbing visible in dry conditions.
Control: Increase ambient humidity, shower the plant thoroughly, and apply insecticidal soap or neem oil spray on a weekly cycle.
Fungus gnats
Signs: Larvae destroy fine root hairs, causing wilting; adult flies hover around wet compost.
Control: Ease off watering to let the top inch dry out; use Bti soil drench to eliminate larvae within two to three applications.
Keep interrupted fern pest-free
Healthy plants resist pests best. Get the basics right:
Interrupted Fern pests — FAQ
What is eating my interrupted fern?
Interrupted Fern (Osmunda claytoniana) grown indoors is most bothered by scale insects and spider mites, especially in warm, dry rooms. Fungus gnats attack if the root zone stays waterlogged. This large, vigorous fern is generally tough, but high humidity and good drainage reduce pest pressure significantly.
How do I get rid of scale insects on interrupted fern?
Bumps on stipe bases and frond midribs; yellowing fronds and sticky honeydew on lower surfaces. Scrub off with a soft brush dampened with soapy water; apply horticultural oil spray and repeat every 10 days for a month.
How do I get rid of spider mites on interrupted fern?
Fine bronzing and speckling across frond surfaces; webbing visible in dry conditions. Increase ambient humidity, shower the plant thoroughly, and apply insecticidal soap or neem oil spray on a weekly cycle.
How do I get rid of fungus gnats on interrupted fern?
Larvae destroy fine root hairs, causing wilting; adult flies hover around wet compost. Ease off watering to let the top inch dry out; use Bti soil drench to eliminate larvae within two to three applications.