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Pests
Scale Insects on Ferns
Commonly affects: Various ferns (Polypodiopsida)
Small, immobile brown or tan bumps attach to fronds and stems, secreting honeydew and weakening the plant â one of the most common fern pests.
Potential Causes
- 1Scale insects establishing on frond undersides and stems
- 2Introduction from a nearby infested plant
- 3Dense, sheltered fern foliage providing ideal hiding conditions
Solution Steps
- 1Scrape off visible scale by hand or with a soft brush for light infestations
- 2Apply horticultural oil or insecticidal soap, covering frond undersides thoroughly
- 3Isolate the affected plant from other houseplants until cleared
- 4Repeat treatment every 1-2 weeks for several cycles
Prevention Tip
Check frond undersides regularly on ferns, since scale is one of the most common and easily-overlooked fern pests.
