# Australian plague locust

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Species of grasshopper

Australian plague locust Scientific classification Kingdom: Animalia Phylum: Arthropoda Clade: Pancrustacea Class: Insecta Order: Orthoptera Suborder: Caelifera Family: Acrididae Genus: Chortoicetes Species: C. terminifera Binomial name Chortoicetes terminifera (Walker, 1870) Synonyms[1] Calataria coerulescens Sjöstedt, 1932 Calataria rubripes Sjöstedt, 1921 Calataria terminifera subsp. elegans Sjöstedt, 1921 Calataria terminifera subsp. fuscosanguinea Sjöstedt, 1936 Chortoicetes affinis J.A.G.Rehn, 1907 Chortoicetes yorketownensis Brancsik, 1896 Chortoicetes yorketownensis subsp. fuscus Brancsik, 1896 Epacromia terminifera F.Walker, 1870

The **Australian plague locust** (***Chortoicetes terminifera***) is a species of [locust](/source/Locust) in the family [Acrididae](/source/Acrididae) native to [Australia](/source/Australia), where it is a significant [agricultural pest](/source/Pest_(organism)).[2]

## Description

Adult Australian plague locusts range in size from 20 to 45 mm (0.79 to 1.77 in) in length, and the colour varies from brown to green. In profile, the head is higher than the [thorax](/source/Thorax), and the thorax has an X-shaped mark. The legs have a reddish shank and the wings are clear other than for a dark spot on the periphery.[3]

## Range and habitat

The locusts occur naturally in far northwestern [New South Wales](/source/New_South_Wales) and the adjoining areas of [Queensland](/source/Queensland) and [South Australia](/source/South_Australia), as well as [Western Australia](/source/Western_Australia). From these areas, the locusts can expand from time to time to be found in the agricultural areas of South Australia, New South Wales, including the [Riverina](/source/Riverina), and [Victoria](/source/Victoria_(Australia)).[4] The locust can be found in a variety of grassland and open wooded habitats across the inland areas of the Australian mainland. Upper-level winds may occasionally carry locusts to coastal areas of the mainland and northern [Tasmania](/source/Tasmania) and may establish populations in the eastern valleys of the [Great Dividing Range](/source/Great_Dividing_Range); these populations usually fail to establish themselves for more than a few generations.[5] Climatic change is projected to influence spatial patterns of pest outbreaks, as [climate change](/source/Climate_change) is a primary limiting factor for insect dispersal. The most commercially important locust species in Australia is the Australian plague locust, Chortoicetes terminifera. Invasions wreak havoc on agricultural crops and pastures on a massive scale.

## Life-cycle

A first-[instar](/source/Instar) [nymph](/source/Nymph_(biology)) of *C. terminifera*

Adult locusts feeding on green shoots that follow rain within 24 to 48 hours in warmer months will mature and lay eggs within 5 to 7 days of a rain event. Using their [ovipositors](/source/Ovipositor) to drill a hole, locusts lay their eggs in the soil in a pod. Pods contain around 30 to 50 eggs[6] and locusts lay two or three pods, 5 to 10 days apart. Egglaying often happens *en masse*, with as many as a million laid in a hectare of suitable soil.[6] In good conditions (i.e. warm and moist), eggs take around two weeks to develop.[7]

After hatching, the [nymphs](/source/Nymph_(biology)) take around 20–25 days to complete development in mid-summer.[7] The locust has five [instars](/source/Instar), with the wings becoming more prominent with each moult.[8] After the first and second instars, nymphs form aggregations known as bands; these tend to disperse by the fifth instar.[7] Late-instar bands travel up to 500 m per day. Drier country has large bands congregating that are visible from the air, while in the agricultural regions, bands tend to be smaller.[7]

After its final moult—6 to 8 weeks after egglaying—the adult locust is called a fledgling. Fledglings have three development stages; a growth phase, where wings are strengthened and the [exoskeleton](/source/Exoskeleton) hardened, a fat accumulation stage, and lastly, [oocyte](/source/Oocyte) development.[7] Gregarious populations of locusts form [swarms](/source/Swarm), recurring in central Eastern Australia once every two or three years.[9] The Australian plague locust is less gregarious than other locust species and swarms occur in a continuum from dense swarms through a range of densities down to scattered adults. Swarms may persist for days, dispersing and reforming while following the wind. Swarms may move up to 20 km in a day.[7] Swarms can infest areas up to 50 km2 (19 sq mi), although typical infestations are less than 5 km2 (1.9 sq mi).[10] Swarms can travel up to 800 km (500 mi), tending to move with hot winds and generally towards the coast in most cases.[6]

## Plagues

A small, high-density swarm of *C. terminifera* resting on a [bowling green](/source/Bowls) at [Berrigan, New South Wales](/source/Berrigan%2C_New_South_Wales) in December 2010

When food and climatic conditions are favourable, huge swarms of locusts may develop. The first recorded swarm was in 1844, with further outbreaks from the 1870s onward. After 1900, the intensity and frequency of locust swarms increased, and since the 1920s, a pattern has developed of localised, high-density populations in some locations most years and less frequent major plagues over large areas persisting for one to two years.

Infestations in Western Australia are less frequent.[11] Widespread heavy inland rains, especially in summer, allow plague locusts to reach plague proportions with less regular rain maintaining these high-density populations. During these conditions, the lifecycle pattern may change to one in which the period from hatching to maturity is reduced to 2.5 months.[6] Dry conditions reduce populations to background levels.[11]

Due to its large range and frequent plagues, the Australian plague locust is the most damaging locust species in Australia. Damage is mainly confined to [pasture](/source/Pasture), although crop damage can occur. Advanced winter crops have generally hardened off by early summer, when plague locusts become active and therefore are not favoured, but dry conditions and less advanced crops can be highly susceptible to locust infestation as can young autumn crops.

Medium-density swarm of *C. terminifera* in [Wagga Wagga](/source/Wagga_Wagga), New South Wales in  December 2010

## Human control

Losses in a plague can amount to [$](/source/A%24)3–4 million if protection barriers are ineffective.[7] The [Australian Plague Locust Commission](/source/Australian_Plague_Locust_Commission) is responsible for the monitoring and control of locust outbreaks using the control agent [fipronil](/source/Fipronil) and growth regulators such as [diflubenzuron](/source/Diflubenzuron) in the juvenile nymphal stage.[9][12] Two older-generation [organophosphates](/source/Organophosphates), [fenitrothion](/source/Fenitrothion) and [chlorpyrifos](/source/Chlorpyrifos), are also used occasionally for auxiliary, blanket spray runs, and the bioinsecticide 'Green Guard', made from a native fungal isolate of *[Metarhizium acridum](/source/Metarhizium_acridum)*. The latter is based on technology developed by [CSIRO](/source/CSIRO) and the [LUBILOSA](/source/LUBILOSA) programme, and now accounts for more than 12% of spray applications: for protected, organic farming, or environmentally susceptible areas such as water courses.[9]

## See also

- [Australia portal](https://en.wikipedia.org/wiki/Portal:Australia)

- [Agriculture in Australia](/source/Agriculture_in_Australia)

- [APLC](/source/APLC)

- [Spur-throated locust](/source/Spur-throated_locust), *Austracris guttalosa* – another plague locust in Australia

- Yellow-winged locust, *[Gastrimargus musicus](/source/Gastrimargus_musicus)* – a similar grasshopper

## References

1. **[^](#cite_ref-1)** ["*Chortoicetes terminifera*"](http://www.gbif.org/species/5098434). *[Global Biodiversity Information Facility](/source/Global_Biodiversity_Information_Facility)*. Retrieved 19 September 2021.

1. **[^](#cite_ref-agriculture.vic.gov.au_2-0)** The State of Victoria (1996–2016). ["Fact Sheet: Identification and Biology: Australian Plague Locust"](http://agriculture.vic.gov.au/agriculture/pests-diseases-and-weeds/pest-insects-and-mites/plague-locusts/fact-sheet-identification-and-biology). *Agriculture Victoria*. Retrieved 7 June 2016.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-3)** ["Australian Plague Locust: *Chortoicetes terminifera*"](https://web.archive.org/web/20081201153400/http://www.daff.gov.au/animal-plant-health/locusts/about/id-guide/description_of_adults/1._australian_plague_locust_chortoicetes_terminifera). [Department of Agriculture Fisheries and Forestry](/source/Department_of_Agriculture_Fisheries_and_Forestry). 2007-04-13. Archived from [the original](http://www.daff.gov.au/animal-plant-health/locusts/about/id-guide/description_of_adults/1._australian_plague_locust_chortoicetes_terminifera) on 2008-12-01. Retrieved 2008-12-07.

1. **[^](#cite_ref-DPIVIC_4-0)** ["Plague Locusts – Identification and Biology"](http://www.dpi.vic.gov.au/DPI/nrenfa.nsf/LinkView/E8BECA25F3EF3449CA256F720016696AAEE066A92D83F652CA2570D90013C0A8). Department of Primary Industries (Victoria). 2008-11-06. [Archived](https://web.archive.org/web/20080728022337/http://www.dpi.vic.gov.au/DPI/nrenfa.nsf/LinkView/E8BECA25F3EF3449CA256F720016696AAEE066A92D83F652CA2570D90013C0A8) from the original on 2008-07-28. Retrieved 2008-12-07.

1. **[^](#cite_ref-Distribution_5-0)** ["Distribution of the Australian plague locust"](https://web.archive.org/web/20081204142020/http://www.daff.gov.au/animal-plant-health/locusts/about/australia/distribution). Department of Agriculture Fisheries and Forestry. 2007-08-27. Archived from [the original](http://www.daff.gov.au/animal-plant-health/locusts/about/australia/distribution) on 2008-12-04. Retrieved 2008-12-08.

1. ^ [***a***](#cite_ref-auswild_6-0) [***b***](#cite_ref-auswild_6-1) [***c***](#cite_ref-auswild_6-2) [***d***](#cite_ref-auswild_6-3) Serventy, Vincent (1985). *Wildlife of Australia*. South Melbourne: Sun Books. p. 171. [ISBN](/source/ISBN_(identifier)) [0-7251-0480-5](https://en.wikipedia.org/wiki/Special:BookSources/0-7251-0480-5).

1. ^ [***a***](#cite_ref-Biology_7-0) [***b***](#cite_ref-Biology_7-1) [***c***](#cite_ref-Biology_7-2) [***d***](#cite_ref-Biology_7-3) [***e***](#cite_ref-Biology_7-4) [***f***](#cite_ref-Biology_7-5) [***g***](#cite_ref-Biology_7-6) ["Biology and behaviour of the Australian plague locust"](https://web.archive.org/web/20081210032607/http://www.daff.gov.au/animal-plant-health/locusts/about/australia/biology). Department of Agriculture Fisheries and Forestry. 2008-06-26. Archived from [the original](http://www.daff.gov.au/animal-plant-health/locusts/about/australia/biology) on 2008-12-10. Retrieved 2008-12-08.

1. **[^](#cite_ref-8)** ["Description of an Australian plague locust"](https://web.archive.org/web/20081120014811/http://www.daff.gov.au/animal-plant-health/locusts/about/australia/description). Department of Agriculture Fisheries and Forestry. 2007-04-13. Archived from [the original](http://www.daff.gov.au/animal-plant-health/locusts/about/australia/description) on 2008-11-20. Retrieved 2008-12-08.

1. ^ [***a***](#cite_ref-Spurgin_9-0) [***b***](#cite_ref-Spurgin_9-1) [***c***](#cite_ref-Spurgin_9-2) Spurgin, Peter (September 2006). "Controlling the Australian Plague Locust: Old Foe, New Technologies". *Chemistry in Australia*. **73** (8). [Royal Australian Chemical Institute](/source/Royal_Australian_Chemical_Institute): 24–27. [ISSN](/source/ISSN_(identifier)) [0314-4240](https://search.worldcat.org/issn/0314-4240).

1. **[^](#cite_ref-NSW_10-0)** ["Biology and behaviour of the Australian plague locust"](https://web.archive.org/web/20101228163654/http://www.dpi.nsw.gov.au/agriculture/pests-weeds/insects/locusts/biology). Department of Primary Industries (New South Wales). 2004-03-31. Archived from [the original](http://www.dpi.nsw.gov.au/agriculture/pests-weeds/insects/locusts/biology) on 2010-12-28. Retrieved 2008-12-08.

1. ^ [***a***](#cite_ref-history_11-0) [***b***](#cite_ref-history_11-1) ["History of locust and grasshopper outbreaks in Australia"](https://web.archive.org/web/20081210032614/http://www.daff.gov.au/animal-plant-health/locusts/about/history). Department of Agriculture Fisheries and Forestry. 2008-10-21. Archived from [the original](http://www.daff.gov.au/animal-plant-health/locusts/about/history) on 2008-12-10. Retrieved 2008-12-08.

1. **[^](#cite_ref-APLC_12-0)** ["Locusts"](https://web.archive.org/web/20090116140230/http://www.daff.gov.au/animal-plant-health/locusts). Department of Agriculture Fisheries and Forestry. 2008-11-03. Archived from [the original](http://www.daff.gov.au/animal-plant-health/locusts) on 16 January 2009. Retrieved 2008-12-08.

- Wang, B., Deveson, E. D., Waters, C., Spessa, A., Lawton, D., Feng, P., & Liu, D. L. (2019). Future climate change likely to reduce the Australian plague locust (Chortoicetes terminifera) seasonal outbreaks. The Science of the Total Environment, 668(1), 947–957. [https://doi.org/10.1016/j.scitotenv.2019.02.439](https://doi.org/10.1016/j.scitotenv.2019.02.439)

## External links

Wikimedia Commons has media related to [Chortoicetes terminifera](https://commons.wikimedia.org/wiki/Category:Chortoicetes_terminifera).

- [Department of Agriculture Forestry and Fisheries information page on plague locusts](https://web.archive.org/web/20081009170347/http://www.daff.gov.au/animal-plant-health/locusts/about/australia)

- [*Save the Locust*](http://www.savethelocust.com/) - information on learning to live with locusts

- ["Locusts"](https://web.archive.org/web/20210417152351/http://www.daf.qld.gov.au/__data/assets/pdf_file/0009/55593/locusts.pdf) (PDF). *[Department of Agriculture and Fisheries](/source/Department_of_Agriculture_and_Fisheries_(Queensland)), Queensland*. Archived from [the original](http://www.daf.qld.gov.au/__data/assets/pdf_file/0009/55593/locusts.pdf) (PDF) on 2021-04-17.

Taxon identifiers Chortoicetes terminifera Wikidata: Q3002688 Wikispecies: Chortoicetes terminifera AFD: Chortoicetes_terminifera CoL: 5YG4K EoL: 494057 EPPO: CHORTE GBIF: 5098434 iNaturalist: 201621 IRMNG: 10357995 NCBI: 519494 Observation.org: 648811 Open Tree of Life: 349943 Orthoptera Species File (old): 1104535 Orthoptera Species File (new): 811172 Xeno-canto: Chortoicetes-terminifera

Authority control databases National United States Israel Other Yale LUX

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Adapted from the Wikipedia article [Australian plague locust](https://en.wikipedia.org/wiki/Australian_plague_locust) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Australian_plague_locust?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.