How to identify and control orchid scale insects?

You can use a brown brush or a softer toothbrush along the leaf tendons and gently remove them longitudinally (such as overweight, brush marks on the leaves, or even broken leaves). The insect body can also be gently scraped off with your fingernails. Or use cotton wool dipped in nicotine sulfate diluent, or stone sulfur mixture, wipe the leaves.