Pest identification
What's eating my sensitive fern?
Fungus gnats
Signs: Root damage from larvae causes wilting and yellowing; adult gnats swarm the surface of damp compost.
Control: Let the top layer of soil dry slightly, apply sticky yellow traps, and drench soil with Bti solution to kill larvae.
Spider mites
Signs: Stippled, pale fronds with fine webbing under leaves; fronds may curl and drop in severe cases.
Control: Boost humidity, rinse fronds gently, and apply neem oil or insecticidal soap every 5–7 days for at least three treatments.
Mealybugs
Signs: White waxy fluff at the base of emerging croziers and in leaf axils; sticky residue and sooty mould.
Control: Dab with alcohol-soaked cotton swabs, then follow with a neem oil spray weekly until the infestation clears.
Keep sensitive fern pest-free
Healthy plants resist pests best. Get the basics right:
Sensitive Fern pests — FAQ
What is eating my sensitive fern?
Sensitive Fern (Onoclea sensibilis) kept as a houseplant is most at risk from fungus gnats in wet compost and spider mites in dry air. Mealybugs occasionally appear on new fronds. This fern prefers consistently moist soil, so watering balance is key to avoiding both pest and disease issues.
How do I get rid of fungus gnats on sensitive fern?
Root damage from larvae causes wilting and yellowing; adult gnats swarm the surface of damp compost. Let the top layer of soil dry slightly, apply sticky yellow traps, and drench soil with Bti solution to kill larvae.
How do I get rid of spider mites on sensitive fern?
Stippled, pale fronds with fine webbing under leaves; fronds may curl and drop in severe cases. Boost humidity, rinse fronds gently, and apply neem oil or insecticidal soap every 5–7 days for at least three treatments.
How do I get rid of mealybugs on sensitive fern?
White waxy fluff at the base of emerging croziers and in leaf axils; sticky residue and sooty mould. Dab with alcohol-soaked cotton swabs, then follow with a neem oil spray weekly until the infestation clears.