Aulacaspis

Cockerell, 1893

Species Guides

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Aulacaspis is a of armored scale insects in the Diaspididae. These small, sap-sucking insects are characterized by their protective waxy coverings, called tests, which shield their soft bodies. The genus includes numerous , some of which are significant agricultural and horticultural pests. The type species is Aulacaspis rosae. Several species have become outside their native ranges, notably Aulacaspis yasumatsui, which has caused severe damage to cycad worldwide.

Aulacaspis yasumatsui by (c) Lic. Kevin Miguel Garibaldi Fierro, some rights reserved (CC BY), uploaded by Lic. Kevin Miguel Garibaldi Fierro. Used under a CC-BY license.Aulacaspis yasumatsui by (c) Jeffrey W. Lotz, Florida Department of Agriculture and Consumer Services, Bugwood.org, some rights reserved (CC BY). Used under a CC-BY license.Aulacaspis yasumatsui 5194053 by Jeffrey W. Lotz, Florida Department of Agriculture and Consumer Services, Bugwood.org. Used under a CC BY 3.0 us license.

Pronunciation

How to pronounce Aulacaspis: //ˌɔːləˈkæspɪs//

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Identification

Members of Aulacaspis possess coverings (tests) that differ between sexes: females typically have circular or oblong tests, while males have smaller, parallel-sided tests. The tests are formed from wax exuded through pores in the dermis, creating a protective cover over the insect's body. Under magnification, the body is soft and the insect possesses an elongated beak for piercing plant tissues. Specific identification to level requires examination of microscopic morphological features of the female, including pygidial structures and duct arrangements.

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Distribution

The has a broad distribution across tropical and subtropical regions. Individual show distinct ranges: Aulacaspis yasumatsui is native to Southeast Asia (Thailand, China, Hong Kong, Taiwan, Vietnam) but has been introduced to North America (Florida, Hawaii, Georgia, South Carolina, Texas, Alabama, Louisiana), the Caribbean, Central America, Europe (United Kingdom, Bulgaria, Croatia, Cyprus, Hungary, Poland, Slovenia), Africa (South Africa), and Oceania (Fiji, Guam, Palau). Aulacaspis tubercularis occurs across Africa, Asia, Australia, the Americas, and Pacific islands. Aulacaspis tegalensis and A. madiunensis are found in Asia and Africa.

Diet

Members of this are phloem feeders that use to extract contents from plants. The elongated beak penetrates plant tissues to access nutritious fluids, causing direct damage through tissue destruction and potential depletion of host .

Host Associations

  • Cycas - Primary for A. yasumatsui, especially C. revoluta
  • Cycas micronesica - Severely affected by A. yasumatsui
  • Mangifera indica - for A. tubercularis
  • Saccharum - for A. tegalensis and A. madiunensis
  • Schima superba - for A. paralonganae
  • Cinnamomum camphora - for A. guiyangensis
  • Cinnamomum zeylanicum - for A. tubercularis
  • Rosa - Type A. rosae

Life Cycle

Aulacaspis exhibit typical insect development. Females lay beneath their protective test; A. yasumatsui females produce more than 100 eggs. Eggs hatch into mobile first-instar nymphs called , which represent the stage. Crawlers move to new plant areas or disperse by wind or before becoming . After settling, crawlers produce waxy covers and remain fixed in place for subsequent instars. Multiple occur annually in warm climates; A. yasumatsui completes several generations per year in Florida.

Behavior

are the only mobile life stage and serve as the primary mechanism. are and remain permanently attached to plants beneath their protective tests. Females reproduce sexually and retain under their bodies. High densities can develop rapidly due to female and short pre-oviposition periods.

Ecological Role

Aulacaspis function as herbivores that can significantly impact plant health through sustained phloem feeding. Heavy deplete host and can cause plant death. The serves as prey for various natural enemies including coccinellid beetles (Chilocorus spp., Scymnus spp., C. melanophthalmus, C. nigritus, Telsimia sp.) and parasitic . A. yasumatsui has become a disruptive pest in many regions where natural enemy fail to suppress .

Human Relevance

Several Aulacaspis are economically important pests. A. yasumatsui (cycad ) has devastated ornamental cycad horticulture globally since its detection in Miami in 1996, causing severe dieback and plant death. A. tubercularis (mango scale) affects mango production across multiple continents. A. tegalensis and A. madiunensis are sugarcane pests. Management relies on , contact targeting , insecticides, and agents. The international nursery trade has facilitated spread of .

Similar Taxa

  • DiaspisAlso in Diaspididae with tests; Aulacaspis distinguished by specific pygidial duct arrangements and test
  • ChrysomphalusSimilar ; Aulacaspis differs in details of perivulvar pore distribution and patterns
  • QuadraspidiotusOverlapping associations and appearance; separation requires microscopic examination of pygidial structures

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