Black scale on under side of daphne plant

Question

What should I spray it with?

Answer 1

Adult scale insects are protected with a waxy covering and are not controlled well with common contact insecticide sprays. Contact sprays can be used during the early/immature stage of the insect pest life cycle, called "crawler" stage, usually in early spring. You can try a systemic insecticide that penetrates the leaf and translocates into the sap that the pests are feeding on. Below are more options:

https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm