Management Scales, especially armored scales are very difficult to control when mature. Examine plants for live scales by crushing the wax cover. Dead scales do not fall from plants. Select pesticides that have the least effect upon other non-target organisms. For established infestations, apply a second application in two weeks.
Horticultural oils are often effective and relatively safe on beneficial organisms.
Time sprays to coincide with the crawler stage which is most susceptible to insecticides. Insect Management Guide for ornamentals Insect Management Guide for mango Selected References Crane, J.H., and C.W. Campbell. Dekle, G. W. 1976. Florida armored scale insects. Florida Department of Agricultural and Consumer Services, Division of Plant Industry.