Abstract
The South American tree Solanum mauritianum, a major environmentalweed in the high-rainfall regions of SouthAfrica, has proved to be a difficult target forbiological control. Artificially expanded hostranges of candidate agents during quarantinehost-specificity tests, have resulted in therelease of only one agent species which has sofar had a negligible impact on the weed. Thenecessity for additional agents resulted in theimportation of a leaf-mining flea beetle, anunidentified species of Acallepitrix,from Brazil in 1997. No-choice tests inquarantine showed that potential host plantsare confined to the genus Solanum.Although several non-target plants, includingcultivated eggplant (aubergine) and some nativeSouth African Solanum species, sustainedfeeding, oviposition and the development oflarval leaf mines, most of these were inferiorhosts. These results were confirmed by pairedchoice tests, where Acallepitrix sp. nov.displayed significant feeding and ovipositionpreferences for S. mauritianum and where,with few exceptions, more larval leaf mineswere initiated on S. mauritianum.Interpretation of the host-specificity testswas facilitated by a risk assessment matrixwhich suggested that the risk of feeding andoviposition on non-target Solanum plants,including eggplant cultivations, was relativelylow. These and other considerations, such asthe lack of evidence of damage inflicted oncultivated Solanaceae in South America, suggestthat Acallepitrix sp. nov. could beconsidered for release against S. mauritianum in South Africa. However, the results of the host-specificity tests remain ambiguous and until more compelling evidence is obtained from field surveys and open-field trials in Brazil, an application for permission to release the flea beetle in South Africa will not be considered.
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References
Arnold, T.H. and B.C. De Wet, 1993. Plants of southern Africa: names and distribution. Mem. Bot. Surv. S. Afr. No. 62. National Botanical Institute, Pretoria, South Africa.
Briese, D.T., 1999. Open field host-specificity tests: is “natural” good enough for risk assessment? In: T.M. Withers, L. Barton Browne and J. Stanley (eds), Host Specificity Testing in Australasia: towards Improved Assays for Biological Control. CRC for Tropical Pest Management, Brisbane, Australia. pp. 44–59.
Cullen, J.M., 1990. Current problems in host-specificity screening. In: E.S. Delfosse (ed.), Proceedings of the 7th International Symposium on Biological Control of Weeds, March 6–11, 1988, Istituto Sperimentale per la Patologia Vegetale Ministero dell'Agricoltura e delle Foreste, Rome, Italy. pp. 27–36.
Kissmann, K.G. and D. Groth, 1997. Plantas infestantes e nocivas. Tomo 3, 2 Edição. BASF, São Paulo, Brasil.
Lorenzi, H., 1991. Plantas daninhas do Brasil: terrestres, aquáticas, parasitas, tóxicas e medicinais (Segunda Edição). Editora Plantarum, Nova Odessa.
Olckers, T., 1998. Biology and host range of Platyphora semiviridis, a leaf beetle evaluated as a potential biological control agent for Solanum mauritianum in South Africa. BioControl 43: 225–239.
Olckers, T., 1999. Biological control of Solanum mauritianum Scopoli (Solanaceae) in South Africa: A review of candidate agents, progress and future prospects. In: T. Olckers and M.P. Hill (eds), Biological Control of Weeds in South Africa (1990–1998). Afr. Ent. Mem. 1: 65–73.
Olckers, T., 2000a. Biology, host specificity and risk assessment of Gargaphia decoris, the first agent to be released in South Africa for the biological control of the invasive tree Solanum mauritianum. BioControl 45: 373–388.
Olckers, T., 2000b. Biology and physiological host range of four species of Platyphora Gistel (Coleoptera: Chrysomelidae) associated with Solanum mauritianum Scop. (Solanaceae) in South America. Coleopt. Bull. 54: 497–510.
Olckers, T., 2003. Assessing the risks associated with the release of a flowerbud weevil, Anthonomus santacruzi, against the invasive tree Solanum mauritianum in South Africa. Biol. Contr. 28: 302–312.
Olckers, T. and P.E. Hulley, 1989. Insect herbivore diversity of the exotic weed Solanum mauritianum Scop. and three other Solanum species in the eastern Cape. J. Ent. Soc. Sth. Afr. 52: 81–93.
Olckers, T. and P.E.Hulley, 1991. Impoverished insect herbivore faunas on the exotic bugweed Solanum mauritianum Scop. relative to indigenous Solanum species in Natal/KwaZulu and the Transkei. J. Ent. Soc. Sth. Afr. 54: 39–50.
Olckers, T., J.C. Medal and D.E. Gandolfo, 2002. Insect herbivores associated with species of Solanum (Solanaceae) in northeastern Argentina and southeastern Paraguay, with reference to biological control of weeds in South Africa and the United States of America. Florida Entomol. 85: 254–260.
Olckers, T. and H.G. Zimmermann, 1991. Biological control of silverleaf nightshade, Solanum elaeagnifolium, and bugweed, Solanum mauritianum (Solanaceae) in South Africa. Agric. Ecosyst. Environ. 37: 137–155.
Pooley, E., 1993. The Complete Field Guide to Trees of Natal, Zululand and Transkei. Natal Flora Publications Trust, Durban, South Africa.
Pooley, E., 1998. A Field Guide to Wild Flowers: KwaZulu-Natal and the Eastern Region. Natal Flora Publications Trust, Durban, South Africa.
Scott-Shaw, C.R., 1999. Rare and Threatened Plants of KwaZulu-Natal and Neighbouring Regions. KwaZulu-Natal Nature Conservation Service, Pietermaritzburg, South Africa.
Silva, A.G.d'A., C.R. Gonçalves, D.M. Galvão, A.J.L. Gonçalves, J. Gomes, M.D. Silva and L. de Simoni, 1968. Quarto catálogo dos insetos que vivem nas plantas do Brasil seus parasitos e predatores. Parte 2–1 Tomo, Insetos, hospedeiros e inimigos naturais. Ministério da Agricultura, Departemento de Defesa e Inspeção Agropecuária, Rio de Janeiro, Brasil.
Wan, F.-H. and P. Harris, 1997. Use of risk analysis for screening weed biocontrol agents: Altica carduorum Guer. (Coleoptera: Chrysomelidae) from China as a biocontrol agent of Cirsium arvense (L.) Scop. in North America. Biocontrol Sci. Technol. 7: 299–308.
Wells, M.J., A.A. Balsinhas, H. Joffe, V.M. Engelbrecht, G. Harding and C.H. Stirton, 1986. A catalogue of problem plants in South Africa. Mem. Bot. Surv. S. Afr. No. 53. Botanical Research Institute, Department of Agriculture and Water Supply, Pretoria, South Africa.
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Olckers, T. Biology, host specificity and risk assessment of the leaf-mining flea beetle, Acallepitrix sp. nov., a candidate agent for the biological control of the invasive tree Solanum mauritianum in South Africa. BioControl 49, 323–339 (2004). https://doi.org/10.1023/B:BICO.0000025383.56673.12
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DOI: https://doi.org/10.1023/B:BICO.0000025383.56673.12