1. Introduced or established? Convergent evidence indicates imported pine wood nematode vectors occupy gaps in native distributionJean-Claude Grégoire, Jean Artois, Julien Claude, Marius Gilbert, Serge Morand, Géraldine Roux, Gilles San Martin, Dimitrios N. Avtzis, Nick Berkvens, Jochem Bonte, Tine Hauptman, 2026, original scientific article Abstract: Monitoring regulated quarantine plant pathogens and, when relevant, their vectors is compulsory in the European Union. Local Monochamus species (Coleoptera, Cerambycidae) vector the pine wood nematode, Bursaphelenchus xylophilus, a non-native pest already established in most of Portugal. Only 29 M. galloprovincialis individuals were trapped in Belgium in ten years (2013–2022), despite a dense coverage of pheromone-baited traps, suggesting absence or a very rare local occurrence in the country. In the northern neighbouring countries, only one single established population is known in The Netherlands and one in Denmark. A species distribution model based on pheromone-trap catches (negative and positive) of M. galloprovincialis from 4,914 traps in 29 European countries between 2008 and 2019 was developed, using the overall climate conditions and the distribution of seven pine tree species as explanatory variables. The effect of spatial scale was tested with a multi-scale approach. With a 225*225 km spatial grain, the major explanatory variables were the mean diurnal temperature range and, to a lesser extent, the presence of Pinus spp. The model predicted a low probability of presence in Belgium, the Netherlands, Great Britain and north-western Germany compared to southern Europe. Genotyping allowed to conclude that at least some of the beetles caught in Belgium originated from foreign locations. All catches were located close to entry points, suggesting introduction with imported material. The small size of most of the Belgian pine stands may also explain the absence or apparently transient status, or rareness of Monochamus spp. This study thus suggests that surveys in Belgium should privilege entry points rather than local forest stands.
Keywords: biogeography, Drosophila, entomology, invasive species, nematode, seed distribution, invasive species dynamics, forest ecosystems
Published in DiRROS: 15.04.2026; Views: 149; Downloads: 105
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2. Analysis of putative apoplastic effectors from the nematode, Globodera rostochiensis, and identification of an expansin-like protein that can induce and suppress host defensesBarbara Gerič Stare, Shawkat Ali, Maxime Magne, Shiyan Chen, Olivier Côte, Natasa Obradovic, Lubna Jamshaid, Xiaohong Wang, Guy Bélair, Peter Moffett, 2015, original scientific article Keywords: nematode, expansin-like protein, expansin, potato cyst nematode, potato pest, parasitic nematodes, plant celular function
Published in DiRROS: 06.09.2022; Views: 1802; Downloads: 832
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3. Borova ogorčica, Bursaphelenchus xylophilus (Steiner & Buhrer, 1934) Nickle, 1970 - nova nevarnost za slovenske gozdove?Maja Jurc, Gregor Urek, Saša Širca, Vid Mikulič, Branko Glavan, 2003, review article Abstract: V prispevku obravnavamo borovo ogorčico (Bursaphelenchus xylophilus), ki je v Evropi (tudi v Sloveniji) uvrščena na karantensko listo A1. Vrsta je izredno napadalna, povzroča hitro propadanje iglavcev - predvsem vrst rodu Pinus, redko Picea, Abies in Larix. Prikazan je njen areal, ekološke zahteve, gostitelji, bionomija ter simptomi napada na borih. V okviru bionomije borove ogorčice so posebej predstavljeni njeni potrjeni vektorji (Insecta: Cerambycidae - rod Monochamus) in tudi njeni potencialni vektorji (Insecta: Curculionidae - rod Pissodes in Scolytidae). Podajamo razširjenost potencialnih gostiteljskih rastlin borove ogorčice pri nas, podnebne razmere ter kritične točke za vnos in širjenje škodljivca. Ocenjujemo stopnjo fitosanitarnega tveganja pojava borove ogorčice v Sloveniji.
Keywords: nematode, borova ogorčica, fitosanitarno tveganje, bionomija, iglavci, Slovenija
Published in DiRROS: 17.11.2020; Views: 2666; Downloads: 984
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4. Record of a new location for tropical root knot nematode Meloidogyne luci in SloveniaBarbara Gerič Stare, Polona Strajnar, Saša Širca, Nik Susič, Gregor Urek, original scientific article Abstract: The plant parasitic nematode Meloidogyne ethiopica Whitehead has been reported from several European countries, including Slovenia, where it was first found in 2003. However, the description in 2014 of a new sister species, Meloidogyne luci Carneiro et al., 2014, called for the reclassification of all European and Turkish populations of M. ethiopica reported up to this date as M. luci. Both species M. ethiopica and M. luci have a very wide host range of
monocotyledons and dicotyledons. They are pests of important agricultural crops such as maize, potatoes and variety of vegetables, and represent a serious threat for agricultural production in greenhouses as well as in the open fields in many EPPO countries. This paper reports a new location of the tropical root knot nematode species M. luci found in Slovenia in 2015.
Keywords: parasitic nematode, root knot nematode, classification, populations
Published in DiRROS: 20.07.2018; Views: 4429; Downloads: 1900
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5. Discrimination between abiotic and biotic drought stress in tomatoes using hyperspectral imagingNik Susič, Uroš Žibrat, Saša Širca, Polona Strajnar, Jaka Razinger, Matej Knapič, Andrej Vončina, Gregor Urek, Barbara Gerič Stare, original scientific article Abstract: Crop plants are subjected to various biotic and abiotic stresses. Both root-knot nematodes (biotic stress) and water deficiency (abiotic stress) lead to similar drought symptoms in the plant canopy. In this work, hyperspectral imaging was used for early detection of nematode infestation and water deficiency (drought) stress in tomato plants. Hyperspectral data in the range from 400 to 2500 nm of plants subjected to different watering regimes and nematode infestation levels were analysed by partial least squares – discriminant analysis (PLS-DA) and partial least squares – support vector machine (PLS-SVM) classification. PLS-SVM classification achieved up to 100% accuracy differentiating between well-watered and water-deficient plants, and between 90 and 100% when identifying nematode-infested plants. Grouping the data according to the time of imaging increased the accuracy of classification. Shortwave infrared spectral regions associated with the OH and CH stretches were most relevant for the identification of nematode infested plants and severity of infestation. This study demonstrates the capability of hyperspectral imaging to identify and discriminate between biotic and abiotic plant stresses.
Keywords: nematode, Hyperspectral imaging, Drought stress, Root-knot nematode, Tomato
Published in DiRROS: 20.07.2018; Views: 6114; Downloads: 3758
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