Distribution and impact of the native South African wasp, Megastigmus transvaalensis (Hussey, 1956) (Hymenoptera: Torymidae) on the invasive Schinus terebinthifolia Raddi (Anacardiaceae) in South Africa

Authors

  • Nwabisa L Magengelele CBC, Rhodes University
  • Grant Martin Centre for Biological Control, Rhodes University

DOI:

https://doi.org/10.17159/2254-8854/2023/a13583

Keywords:

Biological control, Brazilian pepper tree, seed predator, new association, plant insect interaction

Abstract

Schinus terebinthifolia Raddi (Anacardiaceae) (Brazilian pepper tree) is a tree native to subtropical South America that was introduced into South Africa as an ornamental plant. Globally, it is regarded as one of the world’s worst invasive trees. In South Africa the tree has acquired a native seed-feeding wasp, Megastigmus transvaalensis (Hussey, 1956) (Hymenoptera: Torymidae). The wasp’s native hosts are from the Searsia F.A. Barkley genus (Anacardiaceae), but it has expanded its host range to form a new association with both S. terebinthifolia and its close relative Schinus molle L. (Anacardiaceae). In order to quantify the seed predation by M. transvaalensis on S. terebinthifolia seeds, tree populations were surveyed across the Eastern Cape and KwaZulu-Natal provinces. The wasp was present at 99% of the S. terebinthifolia populations with an average of 22% of the seeds being destroyed. In the Eastern Cape province, the highest seed damage occurred at the start of the winter months, when about 35% of seeds were damaged. This fell to less than 12% in spring and summer when the plants were flowering. Megastigmus transvaalensis was found at nearly all the S. terebinthifolia populations in South Africa, but due to the limited number of predated seeds it is unlikely to reduce population sizes or curb the spread of the invasive alien tree in South Africa.

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References

Boardman JN. 2010. Impact and distribution of the native South African wasp, Megastigmus transvaalensis Hussey (Hymenoptera: Torymidae) on Schinus terebinthifolius Raddi and Schinus mole L. (Anacardiaceae) in KwaZulu-Natal, South Africa. [Honours thesis]. Pietermaritzburg: School of Biological and Conservation Sciences, University of KwaZulu-Natal.

CABI. 2020. Invasive species compendium Schinus terebinthifolius (Brazilian pepper tree). [accessed 14 May 2020]. https://www.cabi.org/isc/datasheet/49031.

Cuda JP, Ferriter AP, Manrique V, Medal JC, editors. 2006. Florida’s Brazilian Peppertree Management Plan: Recommendations from the Brazilian Peppertree Task Force. West Palm Beach, FL, U.S.A.: Florida Exotic Pest Plant Council.

DEA (Department of Environmental Affairs). 2014. Government Gazette. https://www.sanbi.org/wp-content/uploads/2018/04/nembainvasivealienspeciesregulations-12feb2014.pdf. [accessed 23 August 2022].

Dlamini P, Zachariades C, Downs CT. 2018. The effect of frugivorous birds on seed dispersal and germination of the invasive Brazilian pepper tree (Schinus terebinthifolius) and Indian laurel (Litsea glutinosa). South African Journal of Botany. 114: 61–68. https://doi.org/10.1016/j.sajb.2017.10.009.

Ewel JJ, Ojima DS, Karl DA, De Busk WF. 1982. Schinus in successional ecosystems of Everglades National Park. Everglades National Park, South Florida Research Center. Homestead, FL. Report T-676.

Ferreira-Filho PJ, Piña-Rodrigues F, Silva J, Guerreiro JC, Ghiotto TC, Piotrowski I, Dias LP, Wilcken CF, Zanuncio JC. 2015. The exotic wasp Megastigmus transvaalensis (Hymenoptera, Torymidae), first record and damage on the Brazilian peppertree, Schinus terebinthifolius drupes, in São Paulo, Brazil. Anais da Academia Brasileira de Ciências. 87(4): 2091–2095. https://doi.org/10.1590/0001-3765201520140478.

Grissell EE, Hobbs KR. 2000. Megastigmus transvaalensis (Hussey) (Hymenoptera, Torymidae) in California, methods of introduction and evidence of host shifting. In: Hymenoptera, evolution, biodiversity and biological control. Fourth International Hymenoptera Conference, held in Canberra, Australia, January 1999. p. 267–280. Canberra: CSIRO Publishing.

Habeck DH, Bennett FD, Grissell EE. 1989. First record of a phytophagous seed chalcid from Brazilian peppertree in Florida. Florida Entomologist. 72(2): 378–379. https://doi.org/10.2307/3494922.

Hight SD, Horiuchi I, Vitorino MD, Wikler C, Pedrosa-Macedo JH. 2003. Biology, host specificity tests, and risk assessment of the sawfly Heteroperreyia hubrichi, a potential biological control agent of Schinus terebinthifolius in Hawaii. Biological Control. 48(4): 461–476.

Martin GD, Magengelele NL, Paterson ID, Sutton GF. 2020. Climate modelling suggests a review of the legal status of Brazilian pepper Schinus terebinthifolia in South Africa is required. South African Journal of Botany. 132: 95–102. https://doi.org/10.1016/j.sajb.2020.04.019.

Panetta FD, Mckee J. 1997. Recruitment of the invasive ornamental, Schinus terebinthifolius is dependent upon frugivores. Australian Journal of Ecology. 22(4): 432–438. https://doi.org/10.1111/j.1442-9993.1997.tb00694.x.

SAPIA. South African Plant Invader Atlas. 2018. Available at: https://www.arc.agric.za/arc-ppri/weeds/Pages/Geographical-Distribution-of-IAPs-in-Southern-Africa-(SAPIA).aspx. [accessed 23 August 2022].

Scheffer SJ, Grissell EE. 2003. Tracing the geographical origin of Megastigmus transvaalensis (Hymenoptera, Torymidae), an African wasp feeding on a South American plant in North America. Molecular Ecology. 12(2): 415–421. https://doi.org/10.1046/j.1365-294X.2003.01725.x.

Verma P, Majee M. 2013. Seed germination and viability test in tetrazolium (TZ) assay. Bio-Protocol. 3(17):e884. https://doi.org/10.21769/BioProtoc.884.

Wheeler GS, Massey LM, Endries M. 2001. The Brazilian peppertree drupe feeder Megastigmus transvaalensis (Hymenoptera, Torymidae): Florida distribution and impact. Biological Control. 22(2):139–148. https://doi.org/10.1006/bcon.2001.

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Published

2023-02-24

How to Cite

1.
Magengelele N, Martin G. Distribution and impact of the native South African wasp, Megastigmus transvaalensis (Hussey, 1956) (Hymenoptera: Torymidae) on the invasive Schinus terebinthifolia Raddi (Anacardiaceae) in South Africa. Afr. Entomol. [Internet]. 2023 Feb. 24 [cited 2024 Apr. 14];31. Available from: https://www.africanentomology.com/article/view/13583

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