{{Short description|Species of cricket-like animal}} {{Speciesbox | name = Tawny mole cricket | image = Scapteriscus vicinus.JPG | taxon = Neoscapteriscus vicinus | authority = ([[Samuel Hubbard Scudder|Scudder]], 1869) <ref name=OSF>{{cite web |url=http://orthoptera.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1128765 |title=Species ''Neoscapteriscus vicinus'' (Scudder, 1869) |work=Orthoptera Species File (Version 5.0/5.0) |access-date=2015-05-14}}</ref> | synonyms = * ''Neoscapteriscus agassizii''<small> (Scudder, 1869)</small> * ''Scapteriscus vicinus''<small> (Scudder, 1869)</small> | synonyms_ref = <ref name=OSF/> }}
'''''Neoscapteriscus vicinus''''', commonly known as the '''tawny mole cricket''', is a [[species]] of insect in the mole cricket family, [[mole cricket|Gryllotalpidae]]. This species is native to South America and also occurs in the Southern United States, where it arrived as a contaminant of ship's ballast around 1900. Colombian insect taxonomist Oscar Cadena-Castañeda studied specimens of the genus which had been called ''Scapteriscus'', and decided that it included two groups; a smaller group (the true ''Scapteriscus'') and a larger group that he named ''Neoscapteriscus'' (a new genus) in 2015.<ref>{{cite journal | title = The phylogeny of mole crickets (Orthoptera: Gryllotalpoidea: Gryllotalpidae) | author = Cadena-Castañeda, O.J. | year = 2015 | journal = Zootaxa | volume = 3985| issue = 4| pages = 451–490|doi=10.11646/zootaxa.3985.4.1}}</ref> North American mole cricket taxonomists agreed with his decision and altered Orthoptera Species File Online accordingly.
==Description== [[File:N.vicinus.tif|thumb|''Neoscapteriscus vicinus'']] ''N. vicinus'' is a medium-sized mole cricket. Members of this genus are characterized by having two sharp claws and a blade-like process with a sharp edge on their fore legs. Other mole crickets have three or four claws.<ref name=rod>{{cite journal | author = Rodríguez F., Heads S. | year = 2012 | title = New mole crickets of the genus ''Scapteriscus'' Scudder from Colombia (Orthoptera: Gryllotalpidae; Scapteriscinae) | url = http://www.mapress.com/zootaxa/2012/f/z03282p068f.pdf | format = PDF | journal = Zootaxa | volume = 3282 | pages = 61–68 }}</ref> Its colour is yellowish-brown with a dark prothorax. It can be differentiated from the rather similar ''[[Neoscapteriscus borellii]]'' by the two claws that are almost touching at the base, whereas in ''N. borellii'', they are widely separated. The song of ''N.vicinus'', produced only by the males, is a loud trill with a frequency of 130 Hz.<ref name=Capinera/>
==Distribution and habitat== ''N. vicinus'' is native to South America. Since arriving in the United States, it has increased its range, which now extends from North Carolina to Louisiana and the whole of Florida, and west to Texas. Though thought of primarily as a pest of turf and grassland, it also damages many crop plants, including tomatoes, strawberries, vegetables, peanuts, sugarcane, tobacco, and ornamental plants.<ref name=Capinera>{{cite web |url=http://entnemdept.ifas.ufl.edu/creatures/orn/turf/pest_mole_crickets.htm |title=Shortwinged mole cricket, Southern mole cricket, Tawny mole cricket |author1=Capinera, John L. |author2=Leppla, Norman C. |date=2013-10-01 |work=Featured creatures |publisher=University of Florida |access-date=2015-05-16}}</ref>
==Ecology== The tawny mole cricket burrows in sandy soil, creating galleries, usually in the upper {{convert|25|cm|0|abbr=on}}, the depth depending on the temperature and soil moisture content. In Florida, the adults are active in spring and again in autumn, completing a single lifecycle during the summer and overwintering as a large [[Nymph (biology)|nymph]]. ''N. vicinus'' is [[Herbivore|herbivorous]] and feeds on the roots and young shoots of plants, and also causes damage to plants through its burrowing activities. Breeding takes place in spring and autumn, with the male calling soon after sunset to attract a female. After copulation, the female lays between 25 and 60 eggs in an underground chamber, the entrance to which is then blocked with soil. The eggs hatch about 3 weeks later. The nymphs take several months to develop fully, passing through eight to 10 moults.<ref name=Weed>{{cite thesis |author=Weed, Aaron Scott |year=2003 |title=Reproductive strategy of ''Pheropsophus aequinoctialis'' L.: fecundity, fertility, and oviposition behavior; and influence of mole cricket egg chamber depth on larval survival |publisher=[[University of Florida]] |degree=[[Master of Science|M.S.]] |url=http://etd.fcla.edu/UF/UFE0001010/weed_a.pdf |format=[[Portable Document Format|PDF]] }}{{Dead link|date=August 2025 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
In an attempt to reduce the damage done by ''Neocapteriscus'' mole crickets in Florida, [[biological pest control]] has been attempted using natural enemies introduced from South America. It was considered to have been achieved by 2004, when the program at the University of Florida was shut down. In 2006, a summary publication announced success: a 95% reduction in mole cricket numbers in northern Florida, with biological control agents spreading potentially to all parts of Florida.<ref>{{cite web |url=http://www.entsoc.org/PDF/Pubs/Periodicals/AE/AE-2006/Fall/Frank.pdf |title= Permanent control of pest mole crickets (Orthoptera: Gryllotalpidae: ''Scapteriscus'') in Florida |author1=Frank, J.H. |author2=Walker, T.J. |year=2006 |work=American Entomologist. 52: 138-144}}</ref> ''[[Larra bicolor]]'' is a [[parasitoid]] wasp which deposits eggs on adult mole crickets.<ref>Castner, J. L. (1988) Biology of the mole cricket parasitoid ''Larra bicolor'' (Hymenoptera: Sphecidae) pp. 423-432, In Gupta, V. K. (ed.) Advances in Parasitic Hymenoptera Research. Brill; Leiden, 546 pp.</ref><ref>{{cite journal | last1 = Portman | first1 = S. L. | last2 = Frank | first2 = J. H | last3 = McSorley | first3 = R. | last4 = Leppla | first4 = N. C. | year = 2009 | title = Fecundity of ''Larra bicolor'' (Hymenoptera: Crabronidae) and its implications in parasitoid: host interaction with mole crickets (Orthoptera: Gryllotalpidae: ''Scapteriscus'') | url = http://journals.fcla.edu/flaent/article/view/75904/73562 | journal = Florida Entomologist | volume = 92 | pages = 58–63 | doi = 10.1653/024.092.0110 | doi-access = free | archive-date = 2018-05-21 | access-date = 2017-07-08 | archive-url = https://web.archive.org/web/20180521122500/http://journals.fcla.edu/flaent/article/view/75904/73562 | url-status = dead }}</ref> The fly ''[[Ormia depleta]]'' acts in a similar manner, laying eggs on them <ref>{{cite journal | last1 = Frank | first1= J.H. | last2 = Walker | first2 = T.J. | last3 = Parkman | first3 = J.P. | year = 1996 | title = The introduction, establishment and spread of ''Ormia depleta'' in Florida |journal = Biological Control | volume = 6 | pages = 368–377 | doi=10.1006/bcon.1996.0047}}</ref> in both cases, the developing larvae devour the tissues of the host. The [[Steinernema scapterisci|mole cricket nematode]] (''Steinernema scapterisci'') liberates a bacterium which causes [[sepsis]] and death to its [[Host (biology)|host]] mole cricket.<ref name=Capinera/>
In 2016, a graduate student in economics and her committee published an economic analysis of the entire 25-year biological control program. Part of the balance sheet (input) was salaries and equipment and supplies, and part (output) was reduction in damage by mole crickets to cattle pastures determined by a survey of ranchers throughout Florida.<ref>{{cite journal |title= Cost effectiveness of biological control of invasive mole crickets in Florida pastures |author= Mhina, G.J.|display-authors=etal|year=2016 |work=Biological Control |doi=10.1016/j.biocontrol.2016.05.017 |volume=100 |pages=108–115|doi-access=free }}</ref> A cost/benefit ratio of 1/52 was calculated. This did not take into account the benefit to turf grass (lawns, playing fields, and golf courses), to vegetable production, or to any areas outside Florida.
==References== {{Reflist}}
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[[Category:Gryllotalpidae]] [[Category:Insects described in 1869]] [[Category:Insects of South America]]