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San José Scale

Scientific Name
Diaspidiotus perniciosus
Scientific Author
(Comstock, 1881)
(Hemiptera: Diaspididae)
Pest Status
0 Unknown
NZ - Exotic

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Diagnostic Images

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Diagnostic Images (5)
Other Images (1)
Diagnostic Notes
Adult Female

Membranous and pyriform, 0.8-1.5 mm long; several prepygidial abdominal segments each with a few submarginal macroducts on either side, but prepygidial marginal macroducts absent. Anus smaller than a median lobe, situated at least 2.4 times its own length from base of median lobes; perivulvar pores absent. Pygidium with median and second lobes well developed, slightly convergent, each notched on outer margin; second lobes usually as long or longer than associated marginal seta; third lobes usually represented by points, occasionally absent; fourth lobes absent. Paraphyses present between positions of third lobes only, shorter than the lobes, usually thickened towards their inner ends. Plates between lobes pointed or slightly fimbriate; median and first interlobular spaces each containing two plates.

Field Characters

In life, female scale cover more or less circular, flat to slightly convex, 1.0-2.2 mm diameter, grey or light brown with orange or yellow-brown, central or subcentral exuviae. The first-instar exuviae have a crater-like appearance. Male scale cover elongate oval, grey, smaller than that of female, with yellow subterminal exuviae. First instar scale cover blue-black. Body of living female yellow to orange; egg-laying females almost circular. Adult male alate, with orange body.


- Watson, G.W. (2002). Arthropods of Economic Importance: Diaspididae of the World. World Biodiversity Database, CD-ROM. Expert Center for Taxonomic Identification (ETI), University of Amsterdam, The Netherlands.

More Information
Specimen Contact
MAF Plant Health & Environment Laboratory
MAF Plant Health & Environment Laboratory
27/06/2011 01:58 AEST
Last Updated
23/03/2014 22:06 AEST
MAF Plant Health & Environment Laboratory (2011) San José Scale (Diaspidiotus perniciosus) Updated on 3/23/2014 10:06:40 PM Available online: PaDIL -
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License