Pest identification
What's eating my giant wart fern?
Scale insects
Signs: Flat or domed brown shells on rhizomes and midribs; honeydew and sooty mold; fronds yellow
Control: Remove physically with a soft brush; apply horticultural oil or insecticidal soap, ensuring coverage of rhizomes; repeat every 2 weeks
Mealybugs
Signs: Cottony white masses at rhizome joints and frond bases; plant vigor declines
Control: Spot-treat with alcohol-tipped swabs; spray neem oil solution over the whole plant and repeat weekly
Spider mites
Signs: Pale flecking and bronzing on upper frond surface; webbing visible beneath leaflets
Control: Raise humidity, wash fronds with a gentle stream of water, and apply insecticidal soap or neem oil weekly
Keep giant wart fern pest-free
Healthy plants resist pests best. Get the basics right:
Giant Wart Fern pests — FAQ
What is eating my giant wart fern?
Giant Wart Fern (Microsorum grossum) is a robust tropical fern susceptible to scale and mealybugs, which hide along the creeping rhizomes and leaf midribs. In warm, dry indoor air spider mites can also colonise the glossy fronds. Routine inspection of rhizomes and strong air movement keep most pests at bay.
How do I get rid of scale insects on giant wart fern?
Flat or domed brown shells on rhizomes and midribs; honeydew and sooty mold; fronds yellow Remove physically with a soft brush; apply horticultural oil or insecticidal soap, ensuring coverage of rhizomes; repeat every 2 weeks
How do I get rid of mealybugs on giant wart fern?
Cottony white masses at rhizome joints and frond bases; plant vigor declines Spot-treat with alcohol-tipped swabs; spray neem oil solution over the whole plant and repeat weekly
How do I get rid of spider mites on giant wart fern?
Pale flecking and bronzing on upper frond surface; webbing visible beneath leaflets Raise humidity, wash fronds with a gentle stream of water, and apply insecticidal soap or neem oil weekly