%mealy bug%

n. (Zool.), Any of several homopteran scale insects (as, Coccus adonidum, and related species of the families Pseudococcidae and Eriococcidae), that cover themselves with a white powderlike or cottony wax secretion. They are common plant-eating pests in hothouses and are also destructive of fruit trees. [ 1913 Webster + WordNet 1.5 ]