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Scale Insects on Ferns: Recognition and Control

Diagnosis

Perfectly aligned, fuzzy brown spots on the underside of fern fronds are scale insects, not spores. They attach to leaf tissue and feed on sap.

Treatment

Spray with a scale-specific insecticide (e.g., Ortho products) covering leaf undersides thoroughly. Repeat per label. For heavy infestations, consider a systemic soil drench.

Plant Diseases: Overwintering Kimberly Queen and Rabbit's Foot Ferns: Indoor Care and Hardiness; Saving a Frost-Damaged Boston Fern; Overwintering Porch Ferns in a Basement with Grow Lights; Maidenhair Fern Care: Humidity, Light, and Consistency; Tasmanian vs. Australian Tree Ferns: Two Different Species; Tree Fern Root Invasiveness Near Pools; Tree Ferns After a Harsh UK Winter: Assessing Survival and Future Protection; Ferns: Ancient Plants for Modern Gardens; Indoor Ferns: Care Guide for Feathery Foliage and Air Purification; Moths in Hanging Ferns: Caterpillars Are the Real Culprits

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