mealybug /(mēl"y̆*bŭg`)/

meal·y·bug

mealybug

n.
  1. 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. (Zool.)