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Staghorn Fern Scale: Pick Off or Use Oil

Likely brown soft scale or hemispherical scale. Indoors, pick off with a knife while watching TV. Outdoors, spray horticultural oil to suffocate. Images show scale detail.

About Gardening: Scale Eradication on Large Jade: Thoroughness Is Everything; Staghorn Fern Damaged by Scrubbing: Will It Survive?; Overwatered Fern Rescue: Dry It Out, Identify Species; Euonymus Scale Control: Seasonal Oil and Insecticide Schedule; Identifying Lawn Insects and Drought Stress Using Integrated Pest Management; Staghorn Fern (Platycerium bifurcatum): Antler Fronds for Mounting; Scale Insects on Dracaena: Suffocate With Neem Oil; Overwintering Staghorn Fern in North Georgia; Holly Scale Infestation: Identification and Treatment Plan; Scale on Privet Hedge: Oil and Systemic Treatment

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