Pseudococcus dendrobiorum Williams



Field characters

Body oval; probably with 17 pairs of conspicuous lateral filaments, posterior pairs longest; probably not producing ovisac or producing small a under abdomen. On foliage of orchid host.

Validation characters

Oral-rim tubular ducts few, in submarginal areas sometimes with a few medially or mediolaterally; multiloculars few, usually less than 15, normally present on segments VII and VIII, occasionally on VI; without discoidal near eye; circulus oval or quadrate, usually divided by intersegmental line; dorsal setae elongate; antennae 8-segmented.


Pseudococcus dendrobiorum is similar to Pseudococcus microcirculus by having few multiloculars on abdomen, and few dorsal oral-rim tubular ducts. Pseudococcus dendrobiorum can be distinguished (characters of P. microcirculus are in parentheses) by having long dorsal setae (short); discoidal pores not associated with eye (associated with eye); translucent pores on femur and tibia (tibia only).

U.S. quarantine notes

This species was intercepted at U. S. ports-of-entry 12 times between 1995 and 2012, with specimens originating from Australia, Malaysia, Taiwan, and Thailand. We also have examined specimens taken in quarantine from Australia (Dendrobium, orchid); India (orchid); Indonesia (Dendrobium, orchid); Malaysia (Ascocenda, Pomatocalpa); The Philippines (Dendrobium, Phaleanopsis); Sri Lanka (orchid); Taiwan (Phalaenopsis); Thailand (Pholidota). ScaleNet lists hosts only in Orchidaceae. It is most commonly intercepted on orchids. ScaleNet distribution records for P. dendrobiorum include Australia (Northern Territory), Guam, Hawaiian Islands (Hawaii, Oahu) and Papua New Guinea in the Australasian Region; India, Indonesia, The Philippines, Sri Lanka, and Thailand in the Oriental zoogeographic region, and South Korea in the Palaearctics. Several species of Pseudococcus other than P. aurantiacus Williams, P. baliteus Lit, P. calceolariae (Maskell), P. comstocki (Kuwana), P. cryptus Hempel , P. dendrobiorum, P. elisae Borchsenius, P. jackbeardsleyi Gimpel & Miller, P. landoi (Balachowsky), P. longispinus (Targioni Tozzetti), P. lycopodii Beardsley, P. maritimus (Ehrhorn), P. microcirculus McKenzie, P. nakaharai Gimpel & Miller, P. odermatti Miller & Williams, P. philippinicus Williams, P. pithecellobii Gimpel & Miller, P. soleneydos Miller & Gimpel and P. viburni (Signoret) have been taken at U. S. ports-of-entry including: P. agavis MacGregor (Mexico, on Agave); P. apodemus Williams (The Philippines, on Fortunella and Mangifera); P. apomicrocirculus Gimpel and Miller (Mexico, on orchids); P. apoplanus Williams (India, on orchids); P. chenopodii Williams (Australia, on Brunia); P. concavocerarii James (Somalia, on Euphorbia); P. donrileyi Gimpel and Miller (Mexico, on Citrus; Puerto Rico, on Melicoccus); P. eucalypticus Williams (Australia, on Eucalyptus and Chamelaucium); P. gilbertensis Beardsley (Guam, on Dracaena; The Philippines, on Citrus); P. importatus McKenzie (Australia, Brazil, Britain, Canada, Colombia, Costa Rica, Guatemala, Jamaica, Madagascar, Mexico, Panama, Paraguay, Peru, The Philippines, South Africa, Trinidad, and Venezuela, on orchids); P. neomaritimus Beardsley (Mexico, on Citrus, Psidium, and Punica); P. neomicrocirculus Gimpel and Miller (Costa Rica, Guatemala and Venezuela, on orchids); P. orchidicola Takahashi (Kwajalein, Marshall, Samoa, and Tonga, on Alocasia, Dendrobium and Pandanus); P. peregrinabundus Borchsenius (Ecuador, on Musa); P. saccharicola Takahashi (Vietnam, on Saccharum); P. sociabilis (Brazil, on Annona, Cattleya, Carica, Hedera, Hippeastrum, Dahlia, Oncidium, Solanum and Zygopetalum); and P. solomonensis Williams (Micronesia and Palau, on Musa and Piper).

Important references


Scalenet catalog and citation list

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  Pseudococcus dendrobiorum  
 Illustration by Williams

Pseudococcus dendrobiorum

Illustration by Williams

  Pseudococcus dendrobiorum

Pseudococcus dendrobiorum