Tea scale is our most major insect pest on camellias and sasanquas. Horticultural oil sprays are a recommended control method. Oil sprays kill by suffocating so contact to the insects found on the underside of the foliage is needed. Apply 3 times 10 days apart. The best time to control tea scale and other scale insects is in the spring when these pests are in the “crawler” stage of their life cycle.