Aonidiella citrina

Yellow scale
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Order: Hemiptera
Family: Diaspididae
Subfamily: Aspidiotinae
Tribe: Aspidiotini
Genus: Aonidiella
Species: A. citrina
Binomial name
Aonidiella citrina
Coquillett, 1891 [1]

Aonidiella citrina or yellow scale is an armored scale insect from the family Diaspididae. It feeds by sucking sap from plants in a number of plant families, but is mostly known for being a pest of citrus.


Armoured scales are so-called because they are covered by a hard, plate-like structure, the scale. The adult female yellow scale insect is concealed under a thin, pale circular scale through which its yellowish body colour can be seen. The female is legless and remains in the same location permanently, anchored to the surface. The male is a similar colour and has an elongate oval scale. The exuviae (shed nymphal skins) are located near the centre in the female scale but are near one end in the male insect. When the adult male emerges from under its scale after four moults, it has limbs and a single pair of wings and is able to fly rather weakly; it lives for only a few hours, and its sole purpose is to find and mate with a female. [2] [3]

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