Three inherited peace lilies showed shiny, sticky leaves and brown, flaky spots on stems—classic signs of a severe scale insect infestation. The sticky residue is honeydew excreted by the scales as they feed on sap.
Given the heavy infestation, the recommendation is to discard all three plants. Even the seemingly healthy one likely harbors crawlers. Control would be time-consuming and often unsuccessful.
If treatment is attempted, a systemic insecticide like imidacloprid (Bayer Insect Control plus Fertilizer spikes) can be used, but buying new, clean plants is the wiser choice.
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