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Insect aggregations and entomopathogenic nematode occurrence

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For more content, see Nematologica.

Entomopathogenic nematodes of the family Steinernematidae may significantly reduce insect populations. They inhabit most terrestrial habitats and their prevalence can be influenced by biotic factors. Some sawfly species, the geometrid and noctuid moth complexes, and bibionid and sciarid flies characteristically aggregate as diapausing or hibernating larvae in the soil. A survey for entomopathogenic nematodes from habitats characterized by these aggregations was performed in the Czech Republic by collecting soil samples and utilizing Galleria traps in the laboratory. Steinernematids were recovered from 61 of 87 (70.1%) sampled localities. Seven Steinernema species, S. kraussei, S. feltiae, S. affine, S. intermedium, S. bicornutum and two designated as species B and F were identified. Among these, S. kraussei was prevalent in sawfly localities (77.8%) while, in winter moth localities, S. feltiae (55.6%) dominated and S. kraussei (22.2%) and S. affine (25.9%) were common. Soil-dwelling insect aggregations seem to provide an opportunity for entomopathogenic nematode multiplication.

Les nématodes entomopathogènes de la famille des Steinernematidae peuvent réduire significativement les populations d'insectes. Ils occupent la plupart des habitats terrestres et leur prévalence peut être influencée par des facteurs biotiques. Quelques espèces de tenthrèdes move, des Géométrides et des aleurodes Noctuides, de même que les mouches Sciarides et Bibionides forment des aggrégats caractéristiques lorsque leurs larves sont en diapause ou hivernent dans le sol. Une enquête sur ces nématodes entomopathogènes dans des habitats caractérisés par ces aggrégations d'insectes a été réalisée en République tchèque en collectant des échantillons de sol et en utilisant au laboratoire des pièges à Galleria. Des Steinernematides ont été trouvés dans 61 des 87 (70,1%) des localités échantillonnées. Cinq espèces connues de Steinernema (S. kraussei, S. feltiae, S. affine, S. intermedium, S. bicornutum) et deux espèces désignées comme espèces B et F ont été identifiées. S. kraussei était prévalent dans les localités à tenthrèdes (77,8%) tandis que S. feltiae dominait dans les localités à arpenteuse tardive (55,6%) ou S. kraussei (22,2%) et S. affine (25,9%) apparaissaient communs. Les aggrégats d'insectes terricoles semblent ainsi offrir une situation propice à la multiplication des nématodes entomopathogènes.

Affiliations: 1: Department of Insect Pathology, Institute of Entomology CAS, Brani&1ovská 31, 370 05 České Budějovice, Czech Republic; 2: Department of Insect Pathology, Institute of Entomology CAS, Brani&1ovská 31, 370 05 České Budějovice, Czech Republic


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