How to Identify and Control Scale Insects on Orchids

You can use a palm brush or a soft toothbrush to gently remove them lengthwise along the leaf veins (if you press too hard, you will leave brush marks on the leaves or even crack them). You can also gently scrape the insects off with your fingernail. Alternatively, use medicinal cotton dipped in diluted nicotine sulfate solution or lime sulfur mixture to wipe the leaves.