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Effect of storage time and temperature on infectivity, reproduction and development of Heterorhabditis megidis in Galleria mellonella

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For more content, see Nematologica.

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.

Affiliations: 1: Wageningen University, Laboratory of Entomology,P.O. Box 8031, 6700 EH Wageningen, The Netherlands; 2: Plant Research International, P.O. Box 16, 6700 AA Wageningen, The Netherlands


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