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Infection, development, and reproduction of the entomopathogenic nematode Steinernema arenarium (Nematoda: Steinernematidae) in the black vine weevil Otiorhynchus sulcatus (Coleoptera: Curculionidae)

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Steinernema arenarium (Nematoda: Steinernematidae) completed a single generation in larvae of Otiorhynchus sulcatus (F.) (Coleoptera: Curculionidae), at 23 degrees C. From the time of initial exposure of the insects to the nematodes, infection, formation of adults, and appearance of infective juveniles (IJ) occurred at 18, 48, and 120 h, respectively. In second instar (L2) O. sulcatus, small stunted females developed, but in late instar larvae (L6), stunted females co-existed with normal sized females. The stunted female nematodes developing in L6 O. sulcatus produced stunted progeny and the giant females normal sized IJ. The total body length and greatest body diameter of the larger IJ from O. sulcatus were similar to those recorded for normal sized IJ exiting Galleria mellonella (Lepidoptera: Pyralidae). The length of the small IJ was just over half the length of the large IJ produced in O. sulcatus and G. mellonella. IJ of both size groups were pathogenic to G. mellonella, and the small IJ matured into normal giant females within larger hosts. Small IJ of S. arenarium were able to infect L2 O. sulcatus in significantly higher numbers than normal sized IJ. The reasons for the single generation and production of stunted females and IJ are addressed.

Infestation, developpement et reproduction du nematode entomopathogene Steinernema arenarium (Nematoda: Steinernematidae) sur Otiorhynchus sulcatus (Coleoptera: Curculionidae)- Steinernema arenarium (Nematoda: Steinernematidae) n'accomplit, a 23 degrees C, qu'une seule generation dans les larves d'Otiorhynchus sulcatus (F.) (Coleoptera: Curculionidae). A partir de la mise en presence de l'insecte et des nematodes, l'infestation, la formation des adultes et l'apparition des juveniles infestants (IJ) se produisent en, respectivement, 18, 48 et 120 heures. Dans les larves de deuxieme stade (L2) d'O. sulcatus il se developpe des femelles petites et rabougries tandis que dans les larves de dernier stade (L6) de petites femelles coexistent avec des femelles de taille normale. Les petites femelles du nematode qui se sont developpees dans les L6 d'O. sulcatus ont une descendance rabougrie tandis que les femelles geantes produisent des IJ de taille normale. La longueur du corps et le diametre maximal des plus grandes IJ provenant d'O. sulcatus sont equivalents a ceux des IJ de taille normale provenant de Galleria mellonella (Lepidoptera: Pyralidae). La longueur des petites IJ depasse de peu la moitie de celle des grandes IJ produites chez O. sulcatus et G. mellonella. Les IJ des deux groupes de taille sont pathogenes envers G. mellonella, et les petites IJ se developpent en femelles geantes, normales, dans des hotes de plus grande taille. Les petites IJ de S. arenarium peuvent infester O. sulcatus en nombre significativement plus eleve que les IJ de taille normale. Les causes de la generation unique et de la production de femelles et IJ rabougris sont discutees.


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