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General News Biocontrol News and Information 32(3), 17N–24N www.cabi.org/BNI General News The Long and Winding Road: Tradescantia each beetle, which also helped minimize in-breeding. Biocontrol in New Zealand This Herculean effort finally paid off at the end of 2010 when permission was given by MAF (Ministry A Landcare Research project that began eight years of Agriculture and Forestry) to release the first gre- ago with the aim of controlling one of New Zealand’s garine-free line from containment. A shipment was most widespread and problematic weeds, trades- hand-carried to Chris Winks in Auckland for mass cantia (Tradescantia fluminensis), has reached a rearing at the end of December 2010. milestone with the release of the first biocontrol agent. Although plenty of natural enemies were The first release of the leaf beetle in Auckland in identified in the plant’s native range in South March 2011 was understandably greeted with a America, the most promising biocontrol candidates great sense of satisfaction. Further releases have have not been easy to work with. since been made in Northland, Bay of Plenty, Waikato and Manawatu-Wanganui, and more are Tradescantia is one of the world’s most popular ‘pot’ planned for next spring. As this is the first time a bio- plants. It is a hardy, shade-tolerant plant that has control agent has been released against become widespread in frost-free parts of New Zea- tradescantia, the team are monitoring it carefully. land’s North Island and parts of the South Island. This first season, they are watching to see whether Thriving in shaded areas of gardens and bush, tra- female beetles continue to lay eggs over the cooler descantia grows densely on the ground preventing months, and will be looking for signs of establish- regeneration of other plants. It is a threat to regener- ment next spring. Adult feeding damage is quite ation, and hence long-term survival, of indigenous noticeable as the beetles tend to eat notches in scat- forest in northern New Zealand, and is possibly the tered leaves over a wide area. Larvae skeletonize most widespread and troublesome weed of gardens whole leaves sequentially along a stem and if several throughout New Zealand. It is difficult to control as are feeding in the same area, the damage will be it breaks into many pieces when pulled, with almost obvious. every piece of stem capable of resprouting. The plant can also cause canine allergic dermatitis. While the painstaking work with the leaf beetle was making its slow progress, research on other agents The tradescantia leaf beetle (Neolema ogloblini) is was also advancing: Efforts are now being made to native to south-eastern Brazil and north-eastern achieve gregarine-free cultures of two more host-spe- Argentina. Although approval was granted by cific beetles, the tip feeder Neolema abbreviata and ERMA (Environmental Risk Management the stem borer Lema basicostata. The Landcare sci- Authority) to release the beetle in New Zealand in entists pursued this trio despite their parasite 2008, a lengthy delay ensued when it was found that the quarantine culture harboured a gregarine proto- problems because they attack different parts of the zoan gut parasite. It was not known whether the tradescantia plant (leaves, stem, stem-tips) and parasite was already present in New Zealand, how should make a complementary team. Meanwhile, in debilitating it was to the beetles, or whether it could Brazil, Robert Barreto (University of Viçosa) is con- infect other species. The decision was therefore taken tinuing work with a fourth promising agent, the not to release the beetles from containment until a yellow leaf spot fungus Kordyana brasiliense. This parasite-free culture could be obtained. Achieving fungus is host specific and very damaging to New this proved a challenge, not least because so little Zealand tradescantia but it proved impossible to was known about gregarines. experimentally infect plants by standard methods. A novel approach allowed host-specificity testing to be Strict hygiene during rearing in the Lincoln quaran- completed, but there is still some way to go before it tine facility did not help eliminate the leaf beetle can be imported into New Zealand. parasite, so Lindsay Smith and Simon Fowler visited Brazil and collected more leaf beetles. They reared This project is funded by the Department of Conser- each of the new females in isolation in the hope that vation, National Biocontrol Collective (including the some would be free from infection. They used high Auckland Council) and the Ministry of Science and levels of hygiene for adults and eggs to reduce the Innovation under the Beating Weeds programme. likelihood of infection, but low levels for the devel- oping larvae. The rationale for this was that Contact: Chris Winks, Landcare Research, parasites can be difficult to spot at low levels, but New Zealand. keeping the larval culture in not-too-clean conditions Email: [email protected] gave any parasites that might be present the greatest opportunity to express themselves (as a sick Source: What’s New in Biological Control of Weeds? or dying larva or adult). Any sick or dying individuals Nos. 50, 55 and 56. Landcare Research New Zealand were culled, along with any eggs/larvae they might Ltd 2009 & 2011. have produced by then. A complete record of the Web: www.landcareresearch.co.nz/ process was kept, so a ‘family tree’ was available for publications/newsletters/weeds Are we on your mailing list? Biocontrol News and Information is always pleased to receive news of research, conferences, new products or patents, changes in personnel, collaborative agreements or any other information of interest to other readers. If your organization sends out press releases or newsletters, please let us have a copy. In addition, the editors welcome proposals for review topics. 18N Biocontrol News and Information 32(3) New Agent Released against Chromolaena in laena website (hosted by ARC-PPRI): South Africa www.arc.agric.za/home.asp?pid=5229 The release of the weevil Lixus aemulus onto a dense A list of what agents have been released against stand of chromolaena (Chromolaena odorata) on the chromolaena worldwide, by date and country, has south coast of KwaZulu-Natal (KZN) in March 2011 been compiled by Costas Zachariades. A summary marks the first introduction of a stem-boring agent appears in the latest issue of the Chromolaena odo- against chromolaena in South Africa. It is also the rata Newsletter, No. 18 (May 2011). Bang up to date, first release worldwide of this agent, which may it includes the L. aemulus release in South Africa. A prove a useful addition to the suite of agents avail- full version is available on the Chromolaena website able for control of chromolaena elsewhere. (see link above). Two biological control agents are already established Contact: Costas Zachariades, Agricultural Research on chromolaena in South Africa, the arctiid moth Council, Plant Protection Research Institute, Private Pareuchaetes insulata and the agromyzid fly Calyco- Bag X6006, Hilton 3245, South Africa. myza eupatorivora, but both are leaf feeders and are Email: [email protected] only established in good numbers along the coast where chromolaena does not shed its leaves in winter. Turfgrass Bioherbicide Finds a New Pathway Establishing a stem borer on chromolaena is impor- A bioherbicide based on Phoma macrostoma has tant, both because the plant has photosynthetic received conditional registration from the Pest Man- stems and because stem borers are likely to establish agement Regulatory Agency in Canada for control of in the seasonally drier parts of the plant’s invasive a number of broadleaved weeds in turfgrass. This is range in southern Africa. Another agent that attacks an important milestone for a programme in which chromolaena stems, the stem-galling tephritid fly scientists at the AAFC (Agriculture and Agri-Food Cecidochares connexa, is an excellent agent in terms Canada) Saskatoon Research Centre have been col- of host range, efficacy and ease of establishment. It is laborating with a US commercial partner, The Scotts established in Côte d’Ivoire and some countries in Company, Marysville, Ohio. It may also have more Asia and the Pacific, but its narrow host range does widespread importance for the bioherbicide sector, not include the southern African biotype of chromo- for the P. macrostoma team believe that central to laena. their success has been the approach of merging a research model (a bioherbicide innovation chain) South African scientists at ARC-PPRI (Agricultural with a business model (the stage and gate process), Research Council – Plant Protection Research Insti- and getting input from the commercial partner early tute) focused on L. aemulus as an alternative. First in the process “to guide the science behind the tech- collected in Brazil in 1995 by Stefan Neser, labora- nology from discovery to product launch”1. tory testing indicated that it was damaging to South African chromolaena, with two-thirds of infested Although each year many new prospective bioherbi- stems dying, an almost 50% reduction in the dry cides are reported, based on isolate screening and mass of stems, and a 94% reduction in seed produc- biological assessment, very few make it any further. tion. Although host-range testing was completed at Only five or six bioherbicides have been commer- ARC-PPRI Cedara in the late 1990s and early 2000s, cially developed worldwide. Discussing the and permission for the release of L. aemulus was development of bioherbicides last year in Biological obtained from the Department of Agriculture, For- Control, Ash2 argued that, “the future of bioherbi- estry and Fisheries in 2006, substantial delays cides rests with greater collaboration between a wide occurred in obtaining the parallel release permit variety of scientific disciplines and the early and con- from the Department of Environmental Affairs, and tinued input of industry”.
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