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Abstract
The effect of temperature, dose and storage period on the infectivity and development of Heterorhabditis megidis (strain NLH-E 87.3) infective juveniles (IJ) was studied in the laboratory. IJ were stored at 5, 10, 15 and 20°C for a period of up to 70 days (10 weeks). Every second week, mortality, infectivity, reproductive capacity, time to emergence and length of IJ were examined. Galleria mellonella larvae were infested with doses of one and 30 IJ. As the period of storage increased, the number of active nematodes, the infectivity and the reproduction of IJ decreased both at low and high temperatures. Time to first emergence and body length of IJ were significantly affected by time, storage temperature and inoculum level. Independent of the dose and storage periods, highest infectivity and optimal development were observed when IJ were stored at 10 and 15°C. Effets de la durée du stockage et de la température sur le pouvoir infestant, la reproduction et le développement d'Heterorhabditis megidis parasitant Galleria mellonella - Les effets de la température, de la dose d'inoculum et de la durée du stockage sur le pouvoir infestant et le développement des juvéniles infestants (JI) d'Heterorhabditis megidis ont été étudiés au laboratoire. Les JI ont été stockés à 5, 7, 10, 15 et 20°C pendant une période allant jusqu'à 70 jours (10 semaines). Toutes les 2 semaines ont été examinées: la mortalité, le pouvoir infestant, la capacité de reproduction, la durée de l'émergence et la longueur de ces JI. Les larves de Galleria mellonella ont été infestées à deux doses: un et 30 JI. Lorsque la durée du stockage augmente, le nombre de nématodes actifs, le pouvoir infestant et la reproduction des JI diminuent, aussi bien à basse qu'à haute température. La durée de la première émergence et la longueur du corps des JI ont été significativement affectées par la durée et la température du stockage, ainsi que par la valeur de l'inoculum. De façon indépendante de cette dernière valeur et de la durée de stockage, le pouvoir infestant la plus élevée et le développement optimal ont été observés lorsque les JI sont stockés à 10 et 15°C.
Abstract
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).
Ceratothoa retusa (Schiœdte & Meinert, ) is redescribed from the lectotype (here designated) collected from Mozambique, and the range is extended to include the Gulf of Suez in the Red Sea. Ceratothoa retusa is distinctive within the genus with a manifestly small head deeply immersed into pereonite 1, which has prominent, but variable, projecting anterolateral margins. Ceratothoa retusa has a tropical and subtropical Indian Ocean distribution, extending from eastern Africa (and now the Red Sea) eastwards to northern Australia and Indonesia. The only known hosts are the halfbeaks, Hemiramphus far (Forsskål, 1775) and H. robustus Günther, 1866 (Hemiraphidae).
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