Browsing by Author "Branco, Sofia"
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- Eradication programs against non-native pests and pathogens of woody plants in Europe: which factors influence their success or failure?Publication . Branco, Sofia; Douma, Jacob C.; Brockerhoff, Eckehard G.; Gomez-Gallego, Mireia; Marcais, Benoit; Prospero, Simone; Franco, José Carlos; Jactel, Hervé; Branco, ManuelaWhen a non-native species succeeds in establishing in a new habitat, one of the possible responses is to attempt its eradication. In the present study, we analysed European eradication programmes against non- native pests and pathogens of woody plants (PPWP) from 1945 to date. Our main goal was to identify which factors affect the success of an eradication programme, reinforcing guidelines for future eradica- tion of PPWP. Data on eradication campaigns were obtained from online databases, scientific and grey literature, and Plant Protection Organizations’ reports. Factors influencing eradication success for both arthropods and pathogens were analysed with LASSO regression and decision tree learning. A total of 848 cases officially declared as eradication attempts were documented in our database (8-fold higher than previous reports). Both the number of programmes and their rate of success increased sharply over the last two decades. Only less than 10% of the non-native organisms affecting woody plants were targeted for attempted eradication despite the high economic and ecological impacts caused by some species for which no efforts were undertaken. Almost one-third of the officially declared cases of eradication concerned organisms that were still restricted to the material with which they were introduced. For these cases the success rate was 100%. The success rate of established species was only 50% for arthropods and 61% for pathogens. The spaSofia Branco et al. / NeoBiota 84: 281–317 (2023)282 tial extent of the outbreak was the factor that most affected the outcome of eradication campaigns. The eradi- cation success decreased abruptly above 100 ha for arthropods and 10 ha for pathogens. Additionally, other variables were shown to influence the outcome of eradication programmes, in particular the type of environ- ment, with the highest eradication success rate found in nurseries and glasshouses, with successful outcomes increasing if quarantine measures were applied and when monitoring included asymptomatic plants. Particu- lar species traits may reduce eradication success: parthenogenetic arthropods, saprotrophic pathogens, wind dispersal, the possibility to remain asymptomatic indefinitely, and the existence of resting spores or stages. In conclusion, small affected areas, quick response, and efficient implementation of quarantine re- strictions, together with particular species traits, may allow a high probability of eradication success. Pre- paredness at the country and European level would allow a larger number of target species to be included in future eradication programmes.
- Preventing invasions of Asian longhorn beetle and citrus longhorn beetle: Are we on the right track?Publication . Branco, Sofia; Faccoli, Maximo; Brockerhoff, Eckehard G.; Roux, Géraldine; Jactel, Hervé; Desneux, Nicolas; Gachet, Emmanuel; Mouttet, Raphaelle; Streito, Jean-Claude; Branco, ManuelaTwo Asian longhorn beetles, Anoplophora glabripennis and Anoplophora chinensis are among the most serious alien invasive species attacking forest and urban trees, both in North America and Europe. Major efforts have been put into preventing further entry and establishment of the two species as well as promoting their successful eradication. Here we review these efforts, their progress and outcome, and scientific advancements in monitoring and control methods. The combined international activities and harmonizing legislative changes in detection and eradication methods have proven worthwhile, with more than 45% of eradication programmes successful in the last 12 years. Some countries were able to completely eradicate all populations and others managed to reduce the area affected. Although the costs of the eradication programmes can be very high, the benefits outweigh inaction. Attempts to eradicate A. chinensis have been more challenging in comparison with those targeting A. glabripennis. For both species, efforts are hampered by the ongoing arrival of new beetles, both from their native regions in Asia and from other invaded regions via bridgehead effects. The methods used for eradication have not changed much during the last decade, and host removal is still the method most commonly used. On the other hand, detection methods have diversified during the last decade with advances in semiochemical research and use of detection dogs. The next decade will determine if eradications continue to be successful, particularly in the case of A. chinesis, which has been targeted in some countries for containment instead of eradication