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Development of the entomopathogenic nematode Heterorhabditis megidis strain NLH-E 87.3 in Galleria mellonella

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For more content, see Nematologica.

Increasing densities of Heterorhabditis megidis strain NLH-E 87.3 infective juveniles (IJ) affected invasion, reproduction, length and time to first emergence of the nematodes in larvae of the greater wax moth, Galleria mellonella. Although the number of nematodes that invaded the host increased with increasing dose, percentage of invasion declined. The number of progeny produced per host initially increased with dose. The highest production of IJ per cadaver was reached at a dose of 300 IJ per host, at that dose 62 ± 3.4 IJ were established per cadaver. Production decreased again significantly at higher densities. The smallest IJ were produced at a dose of 1000 IJ per host and the largest at a dose of 300 IJ per host. Time to first emergence of juveniles was generally shorter when the number of IJ inoculated was large (300-3000 IJ/host).

Des densités croissantes de juvéniles infestants (IJ) d'Heterorhabditis megidis souche NLH-E 87.3 ont affecté la pénétration, la reproduction, la longueur du corps et la date de la première émergence des nématodes des larves de Galleria mellonella. Bien que le nombre de nématodes ayant pénétré dans l'hôte ait augmenté avec l'inoculum, le pourcentage de pénétration a décru. L'importance de la descendance produite par hôte a initialement augmenté avec l'inoculum. La production la plus forte d'IJ par cadavre a été atteinte à un taux d'inoculum de 300 IJ par hôte; à ce taux d'inoculum, 62 ± 3.4 IJ par cadavre avaient pénétré. La production d'IJ a de nouveau diminué significativement aux taux d'inoculum plus élevés. Les IJ les plus petits ont été obtenus au taux d'inoculum de 1000 IJ par hôte. Le temps écoulé jusqu'à la première sortie des juvéniles hors de l'insecte a été généralement plus court lorsque le taux d'inoculum était élevé (300-3000 IJ/hôte).

Affiliations: 1: Research Institute for Plant Protection, P.O. Box 9060, 6700 GW Wageningen, The Netherlands


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