Scale insects are small flat/domed shaped sap feeding pests which can be seen sitting along the veins on the underside of leaves. There are several species of scale insects. Different species of scale insects affect many outdoor and indoor plants ie citrus, orchids, euonymous and hydrangeas.
Product solution: Spray with Provado Ultimate Bug Killer Concentrate 2, ready to use / aerosol, Organic Bug Free, Natria Bug Control.
Cultural methods: Scale insect can be physically removed by scraping them of gently with your thumb nail.