Pest identification
What's eating my roosevelt fern?
Scale insects
Signs: Brown or tan bumps on frond midribs and stems; sticky honeydew on leaves; fronds yellow and weaken
Control: Scrape off with a soft toothbrush, then wipe with rubbing alcohol on a cotton swab; treat persistent infestations with neem oil or horticultural oil spray
Mealybugs
Signs: White cottony fluff at frond bases and leaf axils; stunted new growth; sticky residue
Control: Dab individual colonies with a rubbing-alcohol-soaked cotton swab; spray with diluted neem oil every 7–10 days until clear
Spider mites
Signs: Fine webbing on frond undersides; tiny yellow or bronze stippling; fronds dry out and drop
Control: Raise humidity, mist fronds regularly, and wash plant under a gentle shower; apply insecticidal soap or neem oil spray every 5–7 days
Fungus gnats
Signs: Adults hover around soil; larvae chew fine roots, causing wilting and yellowing despite adequate watering
Control: Let the top 2 inches of soil dry between waterings; use yellow sticky traps for adults; drench soil with Bacillus thuringiensis var. israelensis (Bti) to kill larvae
Keep roosevelt fern pest-free
Healthy plants resist pests best. Get the basics right:
Roosevelt Fern pests — FAQ
What is eating my roosevelt fern?
Roosevelt Fern is most threatened by scale insects and mealybugs indoors. Spider mites also attack in dry conditions, causing stippled, yellowing fronds. Fungus gnats infest soggy soil. Keep humidity high, avoid overwatering, and inspect the base of fronds regularly to catch infestations early.
How do I get rid of scale insects on roosevelt fern?
Brown or tan bumps on frond midribs and stems; sticky honeydew on leaves; fronds yellow and weaken Scrape off with a soft toothbrush, then wipe with rubbing alcohol on a cotton swab; treat persistent infestations with neem oil or horticultural oil spray
How do I get rid of mealybugs on roosevelt fern?
White cottony fluff at frond bases and leaf axils; stunted new growth; sticky residue Dab individual colonies with a rubbing-alcohol-soaked cotton swab; spray with diluted neem oil every 7–10 days until clear
How do I get rid of spider mites on roosevelt fern?
Fine webbing on frond undersides; tiny yellow or bronze stippling; fronds dry out and drop Raise humidity, mist fronds regularly, and wash plant under a gentle shower; apply insecticidal soap or neem oil spray every 5–7 days
How do I get rid of fungus gnats on roosevelt fern?
Adults hover around soil; larvae chew fine roots, causing wilting and yellowing despite adequate watering Let the top 2 inches of soil dry between waterings; use yellow sticky traps for adults; drench soil with Bacillus thuringiensis var. israelensis (Bti) to kill larvae