Abstract
Parthenium hysterophorus (Asteraceae: Heliantheae) (parthenium weed), one of the most aggressive terrestrial weeds, has wide-ranging negative impacts on crop and animal production, biodiversity conservation, and human and animal health in Africa, Asia and Australia. In 2010, South Africa imported the biological control agent, Epiblema strenuana (Lepidoptera: Tortricidae), into quarantine for testing. It is one of the most widespread and damaging agents to have established on parthenium weed in Australia and China. However, it was rejected in India for completely developing on Guizotia abyssinica (Asteraceae: Heliantheae) during laboratory testing. Although G. abyssinica is not cultivated in South Africa, if E. strenuana were to be released here, there are concerns that the moth could readily reach East Africa (where G. abyssinica is an important native commercial oil crop in some countries) due to its dispersal ability and broad host acceptance across several genera. As a matter of responsibility, initial host-range testing in South Africa focussed on determining the susceptibility of selected Ethiopian cultivars of G. abyssinica. Under no-choice conditions, E. strenuana completed development on only one of five test cultivars. However, significant larval feeding damage was recorded on all cultivars. During multiple-choice studies, E. strenuana did not complete development on any of the cultivars, and significantly reduced larval feeding damage was recorded as compared to damage in no-choice tests. Larval development studies showed gall formation and adult eclosion on four cultivars. The interpretation of these results concluded with a decision by South African researchers in 2012 to deprioritise E. strenuana as a potential biological control agent, at least until its host range and potential impact on non-target species in Africa were resolved through field host range trials in Australia.
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Acknowledgments
L. Strathie, M. Gareeb, L. Khumalo, D. Nkala, M. Binedell, S. Mqolombeni (all of ARC-PPRI), are thanked for their technical and research contributions to the project. L. Strathie is also thanked for comments on a final draft of the manuscript. We thank R. McFadyen (retired, previously of CRC for Weed Management, Australia), K. Dhileepan and M. Trevino (Queensland DEEDI, Australia) for their expertise, advice, logistical support, and provision of biocontrol agents. We gratefully acknowledge financial support from the Department of Environmental Affairs (DEA) National Resource Management Programmes (NRMP), the KwaZulu-Natal Department of Agriculture, Environment and Rural Development’s Invasive Alien Species Programme, the Agricultural Research Council, as well as the Agriculture Office within the Bureau for Economic Growth, Agriculture, and Trade (EGAT) of the US Agency for International Development, under the terms of the Integrated Pest Management Collaborative Research Support Program (IPM CRSP; Award No. EPP-A-00-04-00016-00). The opinions expressed herein are those of the author and do not necessarily reflect the views of the US Agency for International Development.
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McConnachie, A.J. Host range tests cast doubt on the suitability of Epiblema strenuana as a biological control agent for Parthenium hysterophorus in Africa. BioControl 60, 715–723 (2015). https://doi.org/10.1007/s10526-015-9675-2
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DOI: https://doi.org/10.1007/s10526-015-9675-2