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Brown insect scale

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From: Renee Reich
Wilmette, IL
Our grapefruit tree has a brown scale infestation. We have battled it for years with malathion spary in the past and more recently with systemic insecticide. This summer, though giving systemic treatment, a new infestation has appeared and looks severe. What would be the best treatment while it is onside on our patio for the summer?

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