A gardener discovered scale insects on their staghorn fern and asked for a safe, effective treatment.
Mix a solution of 1 part dish detergent to 4 parts water. Spray all affected areas thoroughly. The dead scale will not fall off on its own; after a couple of days, wipe them away with a wet rag or gently peel them off with a fingernail.
This treatment typically keeps scale at bay for a year or more. If the infestation persists, over-the-counter insecticides can be used as a last resort, but the soap spray is usually sufficient.
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