Utah State University Extension
Soft scales are insects in the family Coccidae and are closely related to armored and felt scales and mealybugs. Scales are fluid feeders with piercingsucking mouthparts that remove plant phloem or sap. Most life stages are immobile because they anchor their mouthparts into host tissue. They are difficult to control because of their waxy covering, seasonal abundance, and high fecundity.
Murray, Marion and Hodgson, Erin W., "Soft Scales in Utah" (2008). All Current Publications. Paper 953.