Isolation and characterisation of Heterorhabditis spp. (Nematoda: Heterorhabditidae) from Hungary, Estonia and Denmark

in Nematology
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Abstract

Targeted surveys were conducted for the entomopathogenic nematode Heterorhabditis in areas of Denmark, Estonia and Hungary. Isolates were identified by IEF, PCR and cross-fertility tests as belonging to three distinct taxonomic groups: H. bacteriophora, the north-west European (NWE) type of H. megidis and the Irish type of Heterorhabditis. The Irish and NWE types of Heterorhabditis were both present in Denmark (at six and four sites, respectively), while only the NWE type was recovered in Estonia. H. bacteriophora was the dominant heterorhabditid identified in Hungary (ten sites), but the Irish type was also detected at two sites. This is the first report of the Irish type of Heterorhabditis on continental Europe. Co-occurrence of two Heterorhabditis types at a single site was noted in Denmark (Irish and NWE) and in Hungary (Irish and H. bacteriophora). Heterorhabditis was recovered at 38.5% of sites (n = 26) in Denmark (north coast of Sjaelland), 27.3% of the coastal sites (n = 22) in Estonia, and 32.6% of sites (n = 46) in Hungary. Isolation et caracterisation d'especes d'Heterorhabditis (Nematoda: Heterorhabditidae) originaires de Hongrie, d'Estonie et du Danemark - Des prospections ciblees ont ete effectuees dans certaines regions du Danemark, d'Estonie et de Hongrie pour rechercher les nematodes du genre Heterorhabditis. Les souches, identifiees par les methodes de concentration isoelectrique, de PCR et d'hybridation, appartiennent aux trois groupes taxinomiques d'Heterorhabditis : H. bacteriophora, le groupe de l'Europe du nord-ouest (NWE) de H. megidis et le groupe irlandais d'Heterorhabditis. Le groupe irlandais et le groupe NWE sont tous les deux presents au Danemark (dans six et quatre sites, respectivement), mais seul le dernier groupe a ete rencontre en Estonie. H. bacteriophora, present dans dix sites, est l'espece dominante d'Heterorhabditis en Hongrie, mais le groupe irlandais a ete egalement detecte dans deux sites. C'est la premiere fois que le groupe irlandais est rencontre en Europe continentale. La presence simultanee de deux types d'Heterorhabditis est signalee au Danemark (groupe irlandais et groupe NWE) et en Hongrie (groupe irlandais et H. bacteriophora). Des Heterorhabditis ont ete collectes sur 38.5% des 26 sites du Danemark (cote nord de Sjaelland), 27.3% des 22 sites du littoral estonien et 32.6% des 46 sites de Hongrie.

Isolation and characterisation of Heterorhabditis spp. (Nematoda: Heterorhabditidae) from Hungary, Estonia and Denmark

in Nematology

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