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The Collaborative International Dictionary
mealybug

mealybug \meal"y*bug`\, mealy bug \mealy bug\ (m[=e]l"[y^]*b[u^]g`), n. (Zo["o]l.), 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.

Wiktionary
mealybug

n. Any of various insects of the family ''(taxlink Pseudococcidae family noshow=1)'', that secrete a powdery wax and are pests of fruit trees.

WordNet
mealybug

n. scale-like plant-eating insect coated with a powdery waxy secretion; destructive especially of fruit trees [syn: mealy bug]

Wikipedia
Mealybug

Mealybugs are insects in the family Pseudococcidae, unarmored scale insects found in moist, warm climates. They are considered pests as they feed on plant juices of greenhouse plants, house plants and subtropical trees and also act as a vector for several plant diseases.

Usage examples of "mealybug".

This causes a very high nitrogen content, which plant-sucking pests like mealybugs, aphids and scale insects thrive on.

These oils work particularly well on mealybugs, aphids, scale insects, mites, Whiteflies, psyllids, and eggs of other pests like leaf rollers and fruit tree moths.

Mealybugs look like little tufts of waxy cotton in the crevices between stalks and stems.