Jean-Claude Grégoire Honorary Professor

  • jcgregoi@ulb.be

Biographical sketch

Jean-Claude graduated in Agricultural sciences and Forestry at the (at the time) Faculté des Sciences agronomiques de Gembloux, and his PhD at ULB was in forest entomology. He was a research associate at F.R.S. - FNRS, then became a professor at ULB. He is now retired but keeps a few things going on.

Research interest

My main field of interest is the ecology, behaviour and control of forest insects. I am particularly interested in their reproductive strategies, natural enemies, relationships to their hosts, and spread. After decades of research, I must conclude that I have probably been ill advised to focus on particular scolytine species, sometimes awfully difficult to rear in the laboratory, instead of concentrating on particular problems to be tackled with easily cultured model species. But, nevertheless, the species I chose to study still fascinate me, as they are exemplary of fully divergent ecological strategies.

A first pet species, Dendroctonus micans (Coleoptera, Curculionidae, Scolytinae) is a “parasite” of spruce, whose females are usually fertilized by a brother and establish solitarily of healthy trees, which they do not kill and in which they are protected by the tree chemical and physical defenses against competitors and generalist natural enemies. D. micans is however usually fairly well controlled by a very specific predator, the Monotomid beetle Rhizophagus grandis, and we have actually mass-produced these predators during several decades and released them throughout France with perfect control success. We also have brought a batch of Belgian predators to the UK in the early eighties, in order for the British Forestry Commission to start its own rearing programme.

A second scolytine species of choice, Ips typographus, is the most damaging forest pest in Europe. It kills millions of spruces yearly. It has the fascinating property to be able to shift from a scavenging state, at low population density to a predatory regime, when it kills trees. In both states, the insects behave collectively: they forage for scarce, unpredictable resource, and/or mass-attack standing trees. In both cases, their success depends upon a “reservoir” of conspecifics prompt to join the lucky individuals (males) that have found a suitable host and emit pheromones to attract females. At the limits of the range, the “reservoir” is not dense enough to allow aggressive tree killing but, following storms of dry and hot years, the reservoir can expand over large areas. Presently, for example it is suspected that beetles from Belgium and France, which are regularly trapped along the English Channel, tens of kilometers far from the spruce areas in both countries, flew over the Channel and established (hopefully temporary) bridgeheads in Southern England. Joint research with Forest Research (UK) is ongoing.

I also studied several other beetle species, not all of them Scolytinae: Dendroctonus valens in North America and in China, D. punctatus in Canada and Alaska, Monochamus spp. (Coleoptera, Cerambycidae), Thanasimus formicarius (Coleoptera, Cleridae). Recent activities in the lab, in collaboration with Claude Bragard (UCLouvain), also include the distribution in Belgium and dispersal capacities of Hemipteran vectors, or potential vectors, of the bacterium Xylella fastidiosa, and their capacity to transmit the pathogen.

A second field of interest for me is pest risk assessment. I am currently involved in risk assessments for the European Food Safety Authority (EFSA). Earlier on, I also worked as an expert for the Belgian National Plant Protection Organization, the European and Mediterranean Plant Protection Organization (EPPO) and for ANSES (FR).

Projects

Scolibe: risk analysis of harmful bark and ambrosia beetles in the Belgian context (2022-25)

Funded by the Federal Public Service Health, Food Chain Safety and Environment. Main partners: Jochem Bonte at ILVO; Louis Hautier, Gilles San Martin and Alex Kuhn at CRA-W.

Some of the major forest pests in the world are bark and ambrosia beetles (Curculionidae: Scolytinae and Platypodinae). Many of them are expanding their territorial range and threatening new areas, including Belgium. The project addresses these threats, with several components: 1) Identification of species posing the highest risk for Belgium; 2) status of selected species in Belgium; 3) monitoring for prevention and early detection; 4) know-how, networking and toolbox for (rapid) identification; 5) guidelines for control measures.

Ribsurx: design of a statistically sound and risk-based survey plan for the detection of Xylella fastidiosa in Belgium (2022-23)

Funded by Federal Public Service Health, Food Chain Safety and Environment. Main partner: Claude Bragard at Earth and Life Institute, UCLouvain; Jolien Venneman at ILVO.

This project follows and completes previous research in Belgium, with the objective of providing practical tools to risk managers. It will define and map different types of vegetation coverages where X. fastidiosa could establish, rank them according to establishment likeliness and potential impact if contaminated, and propose adapted sampling procedures for both detection and containment.

Research within the framework of the Walloon Observatory of Forest Health (Annual funding, ongoing)

Funded by the Walloon Region. Main partners: Quentin Leroy at OWSF; Louis Hautier, Gilles San Martin, Alex Kuhn and Anne Chandelierat CRA-W.

Scientific support to the activities of the Observatoire wallon de la Santé des Forêts (OWSF).

Agritrap: developing a monitoring capacity for native and exotic Agrilus spp. in Belgium (2021-23, completed)

Funded by the Federal Public Service Health, Food Chain Safety and Environment. Main partners: Jochem Bonte at ILVO; Louis Hautier, Gilles San Martin and Alex Kuhn at CRA-W; Tim Belien at PCFruit.

The project aims to consolidate the European studies conducted so far, and, with collaboration from European and North American researchers within the more global Euphresco project Developing and assessing surveillance methodologies for Agrilus beetles, Its aim is to devise a generic trapping technique for Agrilus spp. (Coleoptera, Buprestidae). The project is also expected to contribute to the development of monitoring tools for specific American and European Agrilus species.

Developing the Fan-trap

Monitoring is an important component of pest management, to prevent or mitigate outbreaks of native pests, and to check for quarantine organisms. Surveys often rely on trapping, especially when the target species respond to semiochemicals. Many traps are available for this purpose, but they are bulky in most cases, which raises transportation and deployment issues, and they are expensive, which limits the size and accuracy of any network. To overpass these difficulties, en-tomologists have used recycled material, such as modified plastic bottles, producing cheap and reliable traps but at the cost of recurrent handywork, not necessarily possible for all end-users (e.g., for national plant protection organizations). These bottle-traps have allowed very large sur-veys which would have been impossible with standard commercial traps, and we illustrate this approach with a few examples. Here we present, under a Creative Commons BY-SA License, the blueprint of a fan-trap, a foldable model, laser-cut from a sheet of polypropylene, that can rapidly be pro-duced in large numbers, and could be transported and deployed in the field with very little ef-forts. Our first field comparisons show that fan-traps are as efficient as bottle-traps, and we de-scribe two cases where they are being used for monitoring.

The Fan-trap documentation can be downloaded here.

Past projects and networks (2010-2020)

  • 2019-2020 – MONODIS (Influence of the distribution, extent and fragmentation of pine stands in Europe on the distribution and abundance of Monochamus spp., the vectors of Bursaphelenchus xylophilus – a contribution to pest risk assessment). With CRAW, Gembloux, and URZF, INRA, Orléans, France. Funded by the Federal Public Service Health, Food Chain Safety and Environment
  • 2018-2019 – Recherche dans le cadre du réseau d’observatoire de la santé des forêts Funded by the Walloon Region
  • 2016-2018 – XFAST (Biological characteristics of potential vectors of Xylella fastidiosa to support sampling and containment procedures). With Earth and Life Institute, UCLouvain. Funded by the Federal Public Service Health, Food Chain Safety and Environment
  • 2014-2018 Action COST FP1401 - A global network of nurseries as early warning system against alien tree pests (Global Warning)
  • 2016-2018 – XYLERIS (Study on Xylella fastidiosa plant hosts and vectors in Belgium and the influence of specific plant growth conditions on disease development) (with UCL, Louvain-la-Neuve, and ILVO, Merelbeke) Funded by the Federal Public Service Health, Food Chain Safety and Environment
  • 2015-2018 - FUNGIFOR (Phytosanitary status of 8 fungi (+ 1 insect vector) infecting trees in Belgium: survey and evaluation of the risk of establishment) (with CRAW, Gembloux, and PCS, Destelbergen). Funded by the Federal Public Service Health, Food Chain Safety and Environment
  • Recherche dans le cadre du réseau d’observatoire de la santé des forêts (2010-2017) Funded by the Walloon Region
  • LWEC Tree Health & Plant Biosecurity Initiative (Phase 1). Accelerated detection and diagnosis of invasive alien pests and pathogens in imported plants. (2013) Funded by DEFRA (UK)
  • MONOCHAMUS: A study of the Monochamus spp. populations present in Belgium in order to assess their capacity to propagate the pine wood nematode, and to develop preventive control methods (2012-2015) Funded by SPF Santé publique, Sécurité de la Chaîne alimentaire et Environnement.
  • Horizon scanning for new pests and invasive species in Belgium and neighbouring areas (ALIEN ALERT)(2012-2013) Funded by the Belgian Science Policy office
  • Individual and collective issues in dispersal and aggregation: from proximal causes to ultimate consequences at contrasting scales (2010-2015). Funded by the Communauté française Research funding Programme (Concerted Research Actions)
  • Aggregation and dispersion patterns in social insects (2010-2014). Funded by F.R.S-FNRS, Brussels, Belgium
  • COST Action FP1002 - Pathway Evaluation and Pest Risk Management in Transport (PERMIT) (2010-2014). Funded by the COST Programme.
  • ISEFOR (Increasing Sustainability of European Forests: Modelling for Security Against Invasive Pests and Pathogens under Climate Change) (2010-2013). Funded by the EU FP7 Programme
  • Mise au point d’une méthode d’élevage de masse du prédateur Rhizophagus grandis pour la lutte biologique contre Dendroctonus micans (2010-2011). Funded by the Ministère de l’Alimentation, de l’Agriculture et de la Pêche (FR)
  • Impact des changements climatiques du passé sur la diversité génétique des insectes phytophages caractérisés par une distribution eurasiatique arctique – alpine (2009-2012). Funded by F.R.S-FNRS, Brussels, Belgium
  • Methodologie voor risico-analyse ter voorbereiding van de registratie van biologische bestrijders (macro-organismen) - MACROREG (2009-2010). Funded by the Federal Public Service Health, Food Chain Safety and Environment
  • Influence of climatic hazards on beech (Fagus sylvatica L.) susceptibility towards xylophagous scolytines (2008-2011). Funded by F.R.S-FNRS, Brussels, Belgium

Publications

Cosmopolitan Scolytinae: strong common drivers, but too many singularities for accurate prediction
J.-C. Grégoire, H. Jactel, J. Hulcr, A. Battisti, D. Inward, F. Petter, and F. Grousset. "NeoBiota", Vol. 84, Pages 81-105, 2023.

Measuring the threat from a distance: insight into the complexity and perspectives for implementing sentinel plantation to test the host range of Xylella fastidiosa
N. Casarin, S. Hasbroucq, J. López-Mercadal, M. Á. Miranda, C. Bragard, and J.-C. Grégoire. "NeoBiota", Vol. 84, Pages 47-80, 2023.

Approaches to forecasting damage by invasive forest insects and pathogens: a cross-assessment
K. F. Raffa, E. G. Brockerhoff, J.-C. Grégoire, R. C. Hamelin, A. M. Liebhold, A. Santini, R. C. Venette, and M. J. Wingfield. "BioScience", Pages biac108, 2023.

Pest categorisation of Amathynetoides nitidiventris
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 6, Pages e07396, 2022.

Pest categorisation of Bagrada hilaris
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. V. Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 2, Pages e07091, 2022.

Pest categorisation of Dendrolimus superans
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 8, Pages e07525, 2022.

Pest categorisation of Aulacaspis tubercularis
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. V. Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, S. Antonatos, V. Kertesz, A. Maiorano, D. Papachristos, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 5, Pages e07307, 2022.

Pest categorisation of Malacosoma disstria
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 3, Pages e07208, 2022.

When the beetles hit the fan: the Fan-Trap, an inexpensive, light and scalable insect trap under a Creative Commons License, for monitoring and experimental use
J.-C. Grégoire, E. Caiti, S. Hasbroucq, J.-M. Molenberg, and S. Willenz. "Insects", Vol. 13, Issue 12, Pages 1122, 2022.

Pest categorisation of Oligonychus perseae
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 6, Pages e07336, 2022.

Pest categorisation of Platypus apicalis
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 6, Pages e07398, 2022.

Pest categorisation of Pulvinaria psidii
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, A. Akrivou, V. Kertesz, A. Maiorano, D. Papachristos, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 8, Pages e07526, 2022.

Pest categorisation of Pseudococcus cryptus
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, S. Antonatos, V. Kertesz, A. Maiorano, D. Papachristos, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 3, Pages e07145, 2022.

Pest categorisation of Thecodiplosis japonensis
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. V. Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 2, Pages e07088, 2022.

Pest categorisation of Russellaspis pustulans
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, A. MacLeod, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. V. Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 6, Pages e07335, 2022.

Pest categorisation of Sirex nitobei
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 3, Pages e07207, 2022.

Pest categorisation of Tetraleurodes perseae
E. P. o. P. Health (PLH), C. Bragard, P. Baptista, E. Chatzivassiliou, F. Di Serio, P. Gonthier, J. A. Jaques Miret, A. F. Justesen, C. S. Magnusson, P. Milonas, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, E. Stefani, H.-H. Thulke, W. Van der Werf, A. Vicent Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, C. Malumphy, V. Kertesz, A. Maiorano, and A. MacLeod. "EFSA Journal", Vol. 20, Issue 6, Pages e07397, 2022.

Une vie de typographe : point des connaissances sur la biologie d'Ips typographus (Linnaeus 1758)
L.-M. Nageleisen, and J.-C. Grégoire. "Revue forestière française", Vol. 73, Issue 4, Pages 479-498, 2022.

Investigating dispersal abilities of Aphrophoridae in European temperate regions to assess the threat of potential Xylella fastidiosa-based pathosystems
N. Casarin, S. Hasbroucq, G. Carestia, A. Glibert, C. Bragard, and J.-C. Grégoire. "Journal of Pest Science", 2022.

Pest categorisation of non-EU Scolytinae of coniferous hosts
E. P. o. P. Health (PLH), C. Bragard, K. Dehnen-Schmutz, F. Di Serio, P. Gonthier, M.-A. Jacques, J. A. Jaques Miret, A. F. Justesen, A. MacLeod, C. S. Magnusson, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, H.-H. Thulke, W. Van der Werf, A. V. Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, V. Kertész, F. Streissl, and P. Milonas. "EFSA Journal", Vol. 18, Issue 1, Pages e05934, 2020.

A worldwide perspective of the legislation and regulations governing sentinel plants
A. M. Vettraino, A. Santini, C. Nikolov, J.-C. Grégoire, R. Tomov, A. Orlinski, T. Maaten, H. Sverrisson, B. Økland, and R. Eschen. "Biological Invasions", Vol. 22, Issue 2, Pages 353-362, 2020.

List of non-EU Scolytinae of coniferous hosts
E. P. o. P. Health (PLH), C. Bragard, K. Dehnen-Schmutz, F. Di Serio, P. Gonthier, M.-A. Jacques, J. A. Jaques Miret, A. F. Justesen, A. MacLeod, C. S. Magnusson, J. A. Navas-Cortes, S. Parnell, R. Potting, P. L. Reignault, H.-H. Thulke, W. van der Werf, A. V. Civera, J. Yuen, L. Zappalà, J.-C. Grégoire, F. Streissl, V. Kertész, and P. Milonas. "EFSA Journal", Vol. 18, Issue 1, Pages e05933, 2020.

The risk of bark and ambrosia beetles associated with imported non-coniferous wood and potential horizontal phytosanitary measures
F. Grousset, J.-C. Grégoire, H. Jactel, A. Battisti, A. Benko Beloglavec, B. Hrašovec, J. Hulcr, D. Inward, A. Orlinski, and F. Petter. "Forests", Vol. 11, Issue 3, Pages 342, 2020.

The risk of bark and ambrosia beetles associated with imported non-coniferous wood and potential horizontal phytosanitary measures
F. Grousset, J.-C. Grégoire, H. Jactel, A. Battisti, A. Benko Beloglavec, B. Hrašovec, J. Hulcr, D. Inward, A. Orlinski, and F. Petter. "Forests", Vol. 11, Issue 3, 2020.

Bark beetle population dynamics in the Anthropocene: challenges and solutions
P. H. W. Biedermann, J. Müller, J.-C. Grégoire, A. Gruppe, J. Hagge, A. Hammerbacher, R. W. Hofstetter, D. Kandasamy, M. Kolarik, M. Kostovcik, P. Krokene, A. Sallé, D. L. Six, T. Turrini, D. Vanderpool, M. J. Wingfield, and C. Bässler. "Trends in Ecology & Evolution", Vol. 34, Issue 10, Pages 914-924, 2019.

Colonization of weakened trees by mass-attacking bark beetles: no penalty for pioneers, scattered initial distributions and final regular patterns
E. Toffin, E. Gabriel, M. Louis, J.-L. Deneubourg, and J.-C. Grégoire. "Royal Society Open Science", Vol. 5, Issue 1, Pages 170454, 2018.

Monochamus species from different continents can be effectively detected with the same trapping protocol
C. K. Boone, J. Sweeney, P. Silk, C. Hughes, R. P. Webster, F. Stephen, L. Maclauchlan, B. Bentz, A. Drumont, B. Zhao, N. Berkvens, H. Casteels, and J.-C. Grégoire. "Journal of Pest Science", 2018.

Traits d’histoire de vie, effet Allee et risques d’introduction de scolytes exotiques
J.-C. Grégoire. "Revue Forestière Française", Issue 6, Pages 597, 2018.

A risk categorisation and analysis of the geographic and temporal dynamics of the European import of plants for planting
R. Eschen, J. C. Douma, J.-C. Grégoire, F. Mayer, L. Rigaux, and R. P. J. Potting. "Biological Invasions", Pages 1-15, 2017.

Is prey specificity constrained by geography? Semiochemically mediated oviposition in Rhizophagus grandis (Coleoptera: Monotomidae) with its specific prey, Dendroctonus micans (Coleoptera: Curculionidae: Scolytinae), and with exotic Dendroctonus species
L. Dohet, and J.-C. Grégoire. "Journal of Chemical Ecology", Vol. 43, Issue 8, Pages 778-793, 2017.

Effects of the wet catching method on the detection of Bursaphelenchus xylophilus from trapped longhorn beetle vectors
N. Berkvens, L. Waeyenberge, H. Casteels, N. de Sutter, M. L. Inácio, A. M. Fontes, C. Boone, J.-C. Grégoire, and N. Viaene. "Nematology", Vol. 19, Issue 6, Pages 671-680, 2017.

The EFSA quantitative approach to pest risk assessment – methodological aspects and case studies
G. Gilioli, G. Schrader, J.-C. Grégoire, A. MacLeod, O. Mosbach-Schulz, T. Rafoss, V. Rossi, G. Urek, and W. van der Werf. "EPPO Bulletin", Vol. 47, Issue 2, Pages 213-219, 2017.

Spiny prey, fortunate prey. Dorsal spines are an asset in intraguild interactions among lady beetles
L. Hautier, G. San Martin, J.-P. Jansen, E. Branquart, and J.-C. Grégoire. "Frontiers in Ecology and Evolution", Vol. 5, 2017.

Climate drivers of bark beetle outbreak dynamics in Norway spruce forests
L. Marini, B. Okland, Jönsson, B. J. Bentz, A. Carroll, B. Forster, J.-C. Grégoire, Hurling, L.-M. Nageleisen, Netherer, H. P. H. P. Ravn, A. Weed, and M. L. Schroeder. "Ecography", 2017.

Modelling collective foraging in endemic bark beetle populations
M. Louis, E. Toffin, J.-C. Grégoire, and J.-L. Deneubourg. "Ecological Modelling", Vol. 337, Pages 188-199, 2016.

Fallen trees' last stand against bark beetles
M. Louis, L. Dohet, and J.-C. Grégoire. "Forest Ecology and Management", Vol. 359, Pages 44-50, 2016.

Bacterial and fungal symbionts of parasitic Dendroctonus bark beetles
L. Dohet, J.-C. Grégoire, A. B. Berasategui, M. K. Kaltenpoth, and P. B. Biedermann. "FEMS Microbiology, Ecology", Vol. 92, Issue 9, 2016.

Harmonia + and Pandora +: risk screening tools for potentially invasive plants, animals and their pathogens
B. B. D’hondt, I. Stiers, S. S. Quoilin, J. Cigar, A. Heughebaert, E. E. Branquart, S. Vanderhoeven, S. S. Roelandt, F. Mayer, V. V. Versteirt, T. Adriaens, E. Ducheyne, G. San Martin Y Gomez, and J.-C. Grégoire. "Biological Invasions", Vol. 17, Issue 6, Pages 1869-1883, 2015.

Comparative multi-locus phylogeography of two Palaearctic spruce bark beetles: influence of contrasting ecological strategies on genetic variation
F. Mayer, F. Piel, A. A. Cassel-Lundhagen, N. Kirichenko, L. Grumiau, B. Okland, C. C. Bertheau, J.-C. Grégoire, and P. Mardulyn. "Molecular Ecology", Vol. 24, Issue 6, Pages 1292-1310, 2015.

Phytosanitary inspection of woody plants for planting at european union entry points: A practical enquiry
R. R. Eschen, L. Rigaux, L. L. Sukovata, A. M. A. M. Vettraino, M. M. Marzano, and J.-C. Grégoire. "Biological Invasions", Vol. 17, Issue 8, Pages 2403-2413, 2015.

Cold tolerance of the predatory ladybird Cryptolaemus montrouzieri
S. S. Maes, J.-C. Grégoire, and P. P. de Clercq. "BioControl", Vol. 60, Issue 2, Pages 199-207, 2015.

Trade patterns of the tree nursery industry in Europe and changes following findings of citrus longhorn beetle, Anoplophora chinensis Forster
R. R. Eschen, J.-C. Grégoire, G. G. M. Hengeveld, B. B. M. de Hoop, L. Rigaux, and R. P. J. R. P. J. Potting. "NeoBiota", Vol. 26, Pages 1-20, 2015.

Natural History and Ecology of Bark Beetles
K. F. K. F. Raffa, J.-C. Grégoire, and S. B. S. Lindgren.
In "Bark Beetles: Biology and Ecology of Native and Invasive Species", Elsevier Inc., Pages 1-40. 2015.

Economics and Politics of Bark Beetles
J.-C. Grégoire, K. F. K. F. Raffa, and S. B. S. Lindgren.
In "Bark Beetles: Biology and Ecology of Native and Invasive Species", Elsevier Inc., Pages 585-613. 2015.

Prey range of the predatory ladybird Cryptolaemus montrouzieri
S. S. Maes, J.-C. Grégoire, and P. P. de Clercq. "BioControl", Vol. 59, Issue 6, Pages 729-738, 2014.

A semi-artificial rearing system for the specialist predatory ladybird Cryptolaemus montrouzieri
S. S. Maes, T. T. Antoons, P. P. de Clercq, and J.-C. Grégoire. "BioControl", Vol. 59, Issue 5, Pages 557-564, 2014.

Flying the nest: male dispersal and multiple paternity enables extrafamilial matings for the invasive bark beetle Dendroctonus micans: Multiple paternity in sib-mating bark beetles
C. Fraser, O. Brahy, P. Mardulyn, L. Dohet, F. Mayer, and J.-C. Grégoire. "Heredity", Vol. 113, Pages 327-333, 2014.

Ecosystem services of mixed species forest stands and monocultures: Comparing practitioners and scientists perceptions with formal scientific knowledge
M. Carnol, L. L. Baeten, E. E. Branquart, J.-C. Grégoire, A. Heughebaert, B. Muys, Q. Ponette, and K. Verheyen. "Forestry", Vol. 87, Issue 5, Pages 639-653, 2014.

Rapid increase in dispersal during range expansion in the invasive ladybird Harmonia axyridis
E. Lombaert, A. Estoup, B. Facon, Joubard, J.-C. Grégoire, A. Jannin, Blin, and T. Guillemaud. "Journal of Evolutionary Biology", Vol. 3, Pages 508-517, 2014.

Dispersal potential of native and exotic predatory ladybirds as measured by a computer-monitored flight mill
S. S. Maes, X. X. Massart, J.-C. Grégoire, and P. P. de Clercq. "BioControl", Vol. 59, Issue 4, Pages 415-425, 2014.

Exploiting fugitive resources: How long-lived is "fugitive"? Fallen trees are a long-lasting reward for Ips typographus (Coleoptera, Curculionidae, Scolytinae)
M. Louis, J.-C. Grégoire, and P.-F. Pelisson. "Forest Ecology and Management", Vol. 331, Pages 129-134, 2014.

Frost impacts on beech (Fagus sylvatica L.) susceptibility to scolytine ambrosia beetles
S. La Spina, C. De Cannière, A. Dekri, and J.-C. Grégoire. "Agricultural and Forest Entomology", Vol. 15, Issue 2, Pages 157-167, 2013.

Assessment of the functional role of tree diversity: the multi-site FORBIO experiment
K. Verheyen, Ceunen, Ampoorter, L. Baeten, Bosman, E. Branquart, M. Carnol, De Wandeler, J.-C. Grégoire, Lhoir, B. Muys, Nurlaya Setiawan, Vanhellemont, and Q. Ponette. "Plant Ecology and Evolution", Vol. 146, Issue 1, Pages 1-10, 2013.

Histoire de l'installation de quelques ravageurs
Thiéry, Vidal, N. Gauthier, Derridji, Vercambre, Goebel, J.-C. Grégoire, and F. Lieutier.
In "Interactions insectes-plantes, Interactions insectes-plantes", Quae & IRD, Pages 623-662. 2013.

The influence of acclimation, endosymbionts and diet on the supercooling capacity of the predatory bug Macrolophus pygmaeus
S. S. Maes, T. T. Machtelinckx, P. P. de Clercq, M. M. Moens, and J.-C. Grégoire. "BioControl", Vol. 57, Issue 5, Pages 643-651, 2012.

Lengthening of insect development on bt zone results in adult emergence asynchrony: does it influence the effectiveness of the high dose/refuge zone strategy?
A. Gryspeirt, and J.-C. Grégoire. "Toxins", Vol. 4, Issue 11, Pages 1323-1342, 2012.

Effects of two varieties of Bacillus thuringiensis maize on the biology of Plodia interpunctella
A. Gryspeirt, and J.-C. Grégoire. "Toxins", Vol. 4, Pages 373-389, 2012.

Invasive alien predator causes rapid declines of native European ladybirds
H. Roy, T. Adriaens, N. Isaac, M. Kenis, T. Onkelinx, G. S. Martin, P. Brown, L. Hautier, R. Poland, D. Roy, R. Comont, R. Eschen, R. Frost, R. Zindel, J. Van Vlaenderen, O. Nedved, H. Ravn, J.-C. Grégoire, J.-C. de Biseau D'Hauteville, and D. Maes. "Diversity and Distributions", 2012.

Low temperature tolerance and starvation ability of the oak processionary moth: Implications in a context of increasing epidemics
N. Meurisse, G. Hoch, A. Schop, A. Battisti, and J.-C. Grégoire. "Agricultural and Forest Entomology", 2012.

Effectiveness of the High Dose/Refuge Strategy for Managing Pest Resistance to Bacillus thuringiensis (Bt) Plants Expressing One or Two Toxins.
A. Gryspeirt, and J.-C. Grégoire. "Toxins", Vol. 4, Issue 10, Pages 810-835, 2012.

L’agroécologie : trajectoire et potentiel. Pour une transition vers des systèmes alimentaires durables.
P. Stassart, P. Baret, J.-C. Grégoire, T. Hance, M. Mormont, D. Reheul, D. Stilmant, G. Vanloqueren, and M. Visser.
In "Agroécologie. Entre pratiques et sciences sociales", Educagri éd., Dijon, Pages 25-51. 2012.

Alkaloids provide evidence of intraguild predation on native coccinellids by Harmonia axyridis in the field
L. Hautier, G. San Martin Y Gomez, P. Callier, J.-C. de Biseau D'Hauteville, and J.-C. Grégoire. "Biological Invasions", Vol. 13, Pages 1805-1814, 2011.

Population dynamics in changing environments: the case of an eruptive forest pest species
K. L. Kausrud, B. Okland, O. Skarpaas, J.-C. Grégoire, N. Erbilgin, and N. C. Stenseth. "Biological Reviews of the Cambridge Philosophical Society", Vol. 87, Issue 1, Pages 34-51, 2011.

Trees wanted — dead or alive! Host selection and population dynamics in tree-killing bark beetles
K. L. Kausrud, J.-C. Grégoire, O. Skarpaas, N. Erbilgin, M. Gilbert, B. Økland, and N. C. Stenseth. "PLoS One", Vol. 6, Issue 5, Pages e18274, 2011.

Larval performances, heterogeneous development and life cycle completion of the Siberian moth, Dendrolimus sibiricus (Lepidoptera: Lasiocampidae) on potential host plants in Europe: a laboratory study on potted trees
N. Kirichenko, J. Flament, Y. Baranchikov, and J.-C. Grégoire. "European Journal of Forest Research", 2011.

Impact of poplar water status on leaf-beetle (Chrysomela populi) survival and feeding
S. La Spina, J.-C. Grégoire, P. Mertens, and C. De Cannière. "Annals of Forest Science", Vol. 67, Pages 209-214, 2010.

Epidémiologie des scolytes de l'épicéa et de leurs ennemis naturels
J.-C. Grégoire, E. Hougardy, J.-M. Molenberg, and N. Warzée.
In "La forêt face aux tempêtes", Éditions Quae, Versailles, Pages 111-120. 2009.

Méthodes d’évaluation des attaques d'Ips typographus (Coleoptera, Scolytinae) en pessière
J.-C. Grégoire, M. Gilbert, C. De Cannière, and Delplace.
In "La forêt face aux tempêtes", Éditions Quae, Versailles, Pages 77-99. 2009.

Native and exotic coniferous species in Europe – possible host plants for the potentially invasive Siberian moth, Dendrolimus sibiricus Tschtv. (Lepidoptera, Lasiocampidae)
N. I. Kirichenko, J. Flament, Y. N. Baranchikov, and J.-C. Grégoire. "EPPO Bulletin", Vol. 38, Issue 2, Pages 259-263, 2008.

Intraguild predation by Harmonia axyridis on coccinellids revealed by exogenous alkaloid sequestration
L. Hautier, J.-C. Grégoire, J. de Schauwers, G. S. Martin, P. Callier, J.-P. Jansen, and J.-C. de Biseau. "Chemoecology", Vol. 18, Issue 3, Pages 191-196, 2008.

A North American invasive seed pest, Megastigmus spermotrophus (Wachtl) (Hymenoptera: Torymidae): Its populations and parasitoids in a European introduction zone
A.-C. Mailleux, A. Roques, J.-M. Molenberg, and J.-C. Grégoire. "Biological Control", Vol. 44, Issue 2, Pages 137-141, 2008.

Kairomone traps: a tool for monitoring the invasive spruce bark beetle Dendroctonus micans (Coleoptera: Scolytinae) and its specific predator, Rhizophagus grandis (Coleoptera: Monotomidae)
N. Meurisse, D. Couillien, and J.-C. Grégoire. "Journal of Applied Ecology", Vol. 45, Issue 2, Pages 537-548, 2008.

Coniferous round wood imports from Russia and Baltic countries to Belgium. A pathway analysis for assessing risks of exotic pest insect introductions: Pathway analysis
F. Piel, M. Gilbert, C. De Cannière, and J.-C. Grégoire. "Diversity and Distributions", Vol. 14, Issue 2, Pages 318-328, 2007.

New occurrence of Ips duplicatus Sahlberg in Herstal (Liege, Belgium)
F. Piel, J.-C. Grégoire, and M. Knížek. "EPPO Bulletin", Vol. 36, Issue 3, Pages 529-530, 2006.

Predator/prey ratios: a measure of bark-beetle population status influenced by stand composition in different French stands after the 1999 storms
N. Warzée, M. Gilbert, and J.-C. Grégoire. "Annals of Forest Science", Vol. 63, Issue 3, Pages 301-308, 2006.

Forecasting Cameraria ohridella invasion dynamics in recently invaded countries: from validation to prediction: A priori prediction of invasion dynamics
M. Gilbert, S. Guichard, J. Freise, J.-C. Grégoire, W. Heitland, N. Straw, C. Tilbury, and S. Augustin. "Journal of Applied Ecology", Vol. 42, Issue 5, Pages 805-813, 2005.

Post-storm surveys reveal large-scale spatial patterns and influences of site factors, forest structure and diversity in endemic bark-beetle populations
M. Gilbert, L.-M. Nageleisen, A. Franklin, and J.-C. Grégoire. "Landscape Ecology", Vol. 20, Issue 1, Pages 35-49, 2005.

Occurrence of Ips typographus (Col., Scolytidae) along an urbanization gradient in Brussels, Belgium
F. Piel, M. Gilbert, A. Franklin, and J.-C. Grégoire. "Agricultural and Forest Entomology", Vol. 7, Issue 2, Pages 161–167, 2005.

Research on Parasitoids and Predators of Scolytidae – A Review
M. Kenis, B. Wermelinger, and J.-C. Grégoire.
In "Bark and Wood Boring Insects in Living Trees in Europe, a Synthesis", Springer Netherlands, Dordrecht, Pages 237-290. 2004.

Biological differences reflect host preference in two parasitoids attacking the bark beetle Ips typographus (Coleoptera: Scolytidae) in Belgium
E. Hougardy, and J.-C. Grégoire. "Bulletin of Entomological Research", Vol. 94, Issue 4, Pages 341-347, 2004.

Spatial pattern of invading Dendroctonus micans (Coleoptera: Scolytidae) populations in the United Kingdom
M. Gilbert, N. Fielding, H. F. Evans, and J.-C. Grégoire. "Canadian Journal of Forest Research", Vol. 33, Issue 4, Pages 712-725, 2003.

Visual, semi-quantitative assessments allow accurate estimates of leafminer population densities: an example comparing image processing and visual evaluation of damage by the horse chestnut leafminer Cameraria ohridella (Lep., Gracillariidae)
M. Gilbert, and J.-C. Grégoire. "Journal of Applied Entomology", Vol. 127, Issue 6, Pages 354–359, 2003.

Cleptoparasitism increases the host finding ability of a polyphagous parasitoid species, Rhopalicus tutela (Hymenoptera: Pteromalidae)
E. Hougardy, and J.-C. Grégoire. "Behavioral Ecology and Sociobiology", Vol. 55, Issue 2, Pages 184-189, 2003.

Marking bark beetle parasitoids within the host plant with rubidium for dispersal studies
E. Hougardy, P. Pernet, M. Warnau, J. Delisle, and J.-C. Grégoire. "Entomologia Experimentalis et Applicata", Vol. 108, Issue 2, Pages 107-114, 2003.

Overview of development of an anti-attractant based technology for spruce protection against Ips typographus: From past failures to future success
R. Jakuš, F. Schlyter, Q.-H. Zhang, M. Blaženec, R. Vaverčák, W. Grodzki, D. Brutovský, E. Lajzová, M. Turčáni, M. Bengtsson, Z. Blum, and J.-C. Grégoire. "Anzeiger für Schädlingskunde", Vol. 76, Issue 4, Pages 89-99, 2003.

Bark-beetle parasitoids population surveys following storm damage in spruce stands in the Vosges region (France)
E. Hougardy, and J.-C. Grégoire. "Integrated Pest Management Reviews", Vol. 6, Issue 3-4, Pages 163-168, 2001.

Dose-dependent response and preliminary observations on attraction range of Ips typographus to pheromones at Low release rates
A. J. Franklin, and J.-C. Grégoire. "Journal of Chemical Ecology", Vol. 27, Issue 12, Pages 2425-2435, 2001.

Past attacks influence host selection by the solitary bark beetle Dendroctonus micans
M. Gilbert, G. Vouland, and J.-C. Grégoire. "Ecological Entomology", Vol. 26, Issue 2, Pages 133–142, 2001.

Spatial distribution of ambrosia-beetle catches: a possibly useful knowledge to improve mass-trapping
J.-C. Grégoire, F. Piel, M. De Proft, and M. Gilbert. "Integrated Pest Management Reviews", Vol. 6, Issue 3-4, Pages 237–242, 2001.

Recapture of Ips typographus L. (Col., Scolytidae) with attractants of low release rates: localized dispersion and environmental influences
A. J. Franklin, C. Debruyne, and J.-C. Grégoire. "Agricultural and Forest Entomology", Vol. 2, Issue 4, Pages 259-270, 2000.

Spruce stands provide natural food sources to adult hymenopteran parasitoids of bark beetles
E. Hougardy, and J.-C. Grégoire. "Entomologia Experimentalis et Applicata", Vol. 96, Issue 3, Pages 253-263, 2000.