Pest identification
What's eating my american wall fern?
Spider mites
Signs: Pale stippling across fronds; fine webbing on undersides; fronds eventually yellow and shrivel
Control: Mist frequently or use a pebble tray; rinse fronds in the shower; apply neem oil or insecticidal soap weekly
Scale insects
Signs: Tan or brown bumps on rhizomes and frond midribs; sticky honeydew and stunted growth
Control: Scrub off scales with a soft brush dipped in soapy water; follow with horticultural oil spray; repeat every 2 weeks
Mealybugs
Signs: Fluffy white deposits at rhizome segments and frond bases; general decline in vigour
Control: Spot-treat with rubbing alcohol; apply diluted neem oil spray over the whole plant every 7–10 days
Keep american wall fern pest-free
Healthy plants resist pests best. Get the basics right:
American Wall Fern pests — FAQ
What is eating my american wall fern?
American Wall Fern (Polypodium virginianum) kept as a houseplant most often encounters spider mites in low-humidity indoor air and scale insects on its rhizomes. Mealybugs can also appear. If moved outside in summer, aphids and slugs may feed on new fronds. Maintaining humidity above 50% prevents most infestations.
How do I get rid of spider mites on american wall fern?
Pale stippling across fronds; fine webbing on undersides; fronds eventually yellow and shrivel Mist frequently or use a pebble tray; rinse fronds in the shower; apply neem oil or insecticidal soap weekly
How do I get rid of scale insects on american wall fern?
Tan or brown bumps on rhizomes and frond midribs; sticky honeydew and stunted growth Scrub off scales with a soft brush dipped in soapy water; follow with horticultural oil spray; repeat every 2 weeks
How do I get rid of mealybugs on american wall fern?
Fluffy white deposits at rhizome segments and frond bases; general decline in vigour Spot-treat with rubbing alcohol; apply diluted neem oil spray over the whole plant every 7–10 days