Pest identification
What's eating my giant maidenhair fern?
Spider mites
Signs: Pale stippling and fine webbing on pinnae; yellowing and frond drop accelerate in low humidity
Control: Increase humidity; shower the whole plant with lukewarm water weekly; spray with insecticidal soap or neem oil every 5–7 days
Mealybugs
Signs: White woolly masses at frond bases and axils; sticky honeydew and stunted growth
Control: Remove with alcohol-dampened cotton swabs; treat with insecticidal soap spray; quarantine and repeat weekly
Scale insects
Signs: Brown or cream bumps on petioles and rachis; sooty mould on honeydew; weakened fronds
Control: Scrape off manually; wipe petioles with neem oil on a cloth; follow up every two weeks for a month
Fungus gnats
Signs: Root damage from larvae; stunted growth; adults visible around compost surface
Control: Let topsoil dry between waterings; use yellow sticky traps; apply Bti drench if larvae persist
Keep giant maidenhair fern pest-free
Healthy plants resist pests best. Get the basics right:
Giant Maidenhair Fern pests — FAQ
What is eating my giant maidenhair fern?
Giant Maidenhair Fern (Adiantum formosum) is a large-growing houseplant or sheltered garden fern susceptible to spider mites in dry indoor air and mealybugs in frond axils. Scale insects can colonise its tall petioles. Fungus gnats breed in moist compost. Its greater size makes infestations easier to spot — regular shower-washing controls most problems.
How do I get rid of spider mites on giant maidenhair fern?
Pale stippling and fine webbing on pinnae; yellowing and frond drop accelerate in low humidity Increase humidity; shower the whole plant with lukewarm water weekly; spray with insecticidal soap or neem oil every 5–7 days
How do I get rid of mealybugs on giant maidenhair fern?
White woolly masses at frond bases and axils; sticky honeydew and stunted growth Remove with alcohol-dampened cotton swabs; treat with insecticidal soap spray; quarantine and repeat weekly
How do I get rid of scale insects on giant maidenhair fern?
Brown or cream bumps on petioles and rachis; sooty mould on honeydew; weakened fronds Scrape off manually; wipe petioles with neem oil on a cloth; follow up every two weeks for a month
How do I get rid of fungus gnats on giant maidenhair fern?
Root damage from larvae; stunted growth; adults visible around compost surface Let topsoil dry between waterings; use yellow sticky traps; apply Bti drench if larvae persist