Pest identification
What's eating my japanese painted fern?
Spider mites
Signs: Fine stippling across the variegated fronds, dulling of the silver and burgundy colouring, webbing on frond undersides, and eventual frond drop.
Control: Boost humidity and move the plant away from radiators. Spray thoroughly with diluted neem oil or insecticidal soap every 7 days for three applications; rinse fronds between treatments.
Aphids
Signs: Clusters of small green or brown insects on emerging croziers and frond undersides; sticky honeydew; distorted new fronds.
Control: Blast off aphids with a strong stream of water. For persistent colonies, apply insecticidal soap spray. Repeat as needed; avoid broad-spectrum pesticides that harm beneficial insects.
Scale insects
Signs: Small tan or brown bumps on stems; sticky residue on fronds below; weakened growth.
Control: Scrape off individual scales with a soft brush dipped in alcohol. Apply neem oil spray to the whole plant and repeat in three weeks to catch newly hatched crawlers.
Keep japanese painted fern pest-free
Healthy plants resist pests best. Get the basics right:
Japanese Painted Fern pests — FAQ
What is eating my japanese painted fern?
Japanese Painted Fern (Athyrium niponicum 'Pictum') kept as a houseplant is most often attacked by spider mites, which bleach the delicate silver, grey, and burgundy fronds. Aphids and scale occasionally appear on indoor specimens. Keeping humidity high and avoiding hot dry draughts is the key preventive measure.
How do I get rid of spider mites on japanese painted fern?
Fine stippling across the variegated fronds, dulling of the silver and burgundy colouring, webbing on frond undersides, and eventual frond drop. Boost humidity and move the plant away from radiators. Spray thoroughly with diluted neem oil or insecticidal soap every 7 days for three applications; rinse fronds between treatments.
How do I get rid of aphids on japanese painted fern?
Clusters of small green or brown insects on emerging croziers and frond undersides; sticky honeydew; distorted new fronds. Blast off aphids with a strong stream of water. For persistent colonies, apply insecticidal soap spray. Repeat as needed; avoid broad-spectrum pesticides that harm beneficial insects.
How do I get rid of scale insects on japanese painted fern?
Small tan or brown bumps on stems; sticky residue on fronds below; weakened growth. Scrape off individual scales with a soft brush dipped in alcohol. Apply neem oil spray to the whole plant and repeat in three weeks to catch newly hatched crawlers.