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Occurrence ofBacillus popilliae and two nematode pathogens in populations ofAmphimallon solstitialis (Col.: Scarabaeidae) near darmstadt, Germany

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Abstract

Populations of the June beetle,Amphimallon solstitialis (Coleoptera: Scarabaeidae), were sampled from grasslands near Darmstadt, Germany, and found to be infected by a number of diseases and parasitic nematodes. Several milky diseased larvac were found, andBacillus popilliae type A 1 isolated as the causative agent. The bacterium readily infected healthy larvae ofA. solstitialis when administeredper os in the laboratory, but was not infective to larvae ofMelolontha hippocastani by this route. A large mermithid nematode was found parasitising 10% of theA. solstitialis larvae at one site andHeterorhabditis bacteriophora was found infecting larvae at the other.

Résumé

Des populations deAmphimallon solstitialis (Col.: Scarabaeidae) ont été échantillonnées dans deux prairies distinctes près de Darmstadt (Allemagne) et se sont révélées infestées par des maladies et des nématodes parasites. Plusieurs larves dans chaque site étaient infectées par la maladie laiteuse etBacillus popillae, type A1 a été isolé comme étant l'agent responsable. La bactérie infeste facilement des larves saines deA. solstitialis quand elle est administrée par voie orale au laboratoire mais n'a pas d'effet infectieux pour les larves deMelolontha hippocastani par cette même voie. Un grand nématode mermithide a été trouvé parasite de 10% des larves deA. solstitialis sur un seul site, mais comme seuls les jeunes ont été trouvés, la détermination à l'espèce n'a pu être faite.Heterorhabditis bacteriophora était responsable de l'infection de 1,5% des larves sur seulement un site. Plusieurs larves deA. solstitialis présentaient une couleur ambrée, identique à celle trouvée sur le scarabéeCostelytra zealandica infecté parSerratia spp., et ne se nourrissaient pas de carotte au laboratoire. Les bactéries isolées à partir de ces larves ne provoquent aucun effet visible quand elles sont données en nourriture à des larves saines.

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Glare, T.R., Jackson, T.A. & Zimmermann, G. Occurrence ofBacillus popilliae and two nematode pathogens in populations ofAmphimallon solstitialis (Col.: Scarabaeidae) near darmstadt, Germany. Entomophaga 38, 441–450 (1993). https://doi.org/10.1007/BF02373076

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