Black scale on under side of daphne plant
What should I spray it with?
Certified GKH Gardening Expert
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: