Pest identification
What's eating my metallic blue fern?
Spider mites
Signs: Fine webbing and pale stippling that dulls the iridescent sheen; fronds may bronze in severe cases
Control: Raise humidity above 60%; spray with insecticidal soap or neem oil; repeat every 5–7 days until clear
Scale insects
Signs: Brown waxy bumps on frond surfaces and rhizome; sticky residue and yellowing
Control: Remove with alcohol-soaked swab; follow with neem oil spray; inspect rhizome carefully at each watering
Mealybugs
Signs: Cottony white clusters at frond bases; slowed growth and leaf distortion
Control: Spot-treat with isopropyl alcohol on a cotton bud; apply diluted neem oil spray weekly until gone
Keep metallic blue fern pest-free
Healthy plants resist pests best. Get the basics right:
Metallic Blue Fern pests — FAQ
What is eating my metallic blue fern?
Metallic Blue Fern (Microsorum thailandicum) is a humidity-loving houseplant most vulnerable to spider mites, which thrive when indoor air is too dry. Scale insects and mealybugs are secondary concerns. Its striking iridescent fronds can show mite stippling early — maintain good humidity to reduce risk significantly.
How do I get rid of spider mites on metallic blue fern?
Fine webbing and pale stippling that dulls the iridescent sheen; fronds may bronze in severe cases Raise humidity above 60%; spray with insecticidal soap or neem oil; repeat every 5–7 days until clear
How do I get rid of scale insects on metallic blue fern?
Brown waxy bumps on frond surfaces and rhizome; sticky residue and yellowing Remove with alcohol-soaked swab; follow with neem oil spray; inspect rhizome carefully at each watering
How do I get rid of mealybugs on metallic blue fern?
Cottony white clusters at frond bases; slowed growth and leaf distortion Spot-treat with isopropyl alcohol on a cotton bud; apply diluted neem oil spray weekly until gone