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Spécificité de Rickettsiella Melolonthae et Pathogénie pour des Vertébrés

Spécificité de Rickettsiella Melolonthae et Pathogénie pour des Vertébrés Summary B. Hurpin: Specificity of Rickettsiella melolonthae and pathogenicity for the Vertebrates The pathogenicity of R. melolonthae agent of the rickettsiosis of Melolontha (Coleopt. Scarabeids) towards various Insect species in three orders: Coleoptera, Lepidoptera, Diptera as well as for some Vertebrates: white mouse, fieldmouse, guinea pig, ewe, has been investigated either by intralymphal or intraperitoneal, injection, and by forced ingestion of a blood suspension and of fat body of diseased white grubs, or by free ingestion. A special attention was given to the Scarabeids in which two groups may be distinguished: the Melolonthidae, Rutelidae, Lucanidae group in which the larvae are infected by the Rickettsia in the same way as in the Melolontha, with an abundant intracytoplasmic multiplication of the rickettsiae elements, and formation of crystals; the Cetoniidae and Dynastidae group in which the larvae are killed following a sequence process or toxemia, without developing a marked rickettsia infection. In the Coleoptera of other families (Calosoma sycophanta, Agriotes sp., Tenebrio molitor, Leptinotarsa decemlineata) and in the Lepidoptera (Pieris brassicae, Mamestra brassicae, Bombyx mori, Galleria mellonella) and the Diptera (Tipula paludosa) investigated, the two kinds of reactions have been observed according to the species. Some of them, such as the larvae of L. decemlineata, B. mori, G. mellonella may allow the R. melolonthae multiplication, others such as P. brassicae and M. brassicae are subject to an occult rickettsiosis transmissible to the progeny and which induces a mortality by a sequence of diseases. With regard to the vertebrates, the culture trials on the vitelline membrane of the chick embryo have not succeeded. After inhalation the white mouse is affected by a pneumonia, followed by a recovery in most cases; by intraperitoneal injection the disease often induces the death, but no abortion. Such phenomena are noticed in the guinea pig, while the ewe develop numerous antibodies after injection. From the experiments carried out with fieldmice fed with diseased white grubs, these animals do not seem to be spreading agents of the germ in the field. This variability of the pathological reactions of the insects and of the vertebrates and this lack of strict specificity of R. melolonthae is a handicap for the eventual use of this microorganism in the white grubs control. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Spécificité de Rickettsiella Melolonthae et Pathogénie pour des Vertébrés

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Publisher
Taylor & Francis
Copyright
© 1971 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1971.12278098
Publisher site
See Article on Publisher Site

Abstract

Summary B. Hurpin: Specificity of Rickettsiella melolonthae and pathogenicity for the Vertebrates The pathogenicity of R. melolonthae agent of the rickettsiosis of Melolontha (Coleopt. Scarabeids) towards various Insect species in three orders: Coleoptera, Lepidoptera, Diptera as well as for some Vertebrates: white mouse, fieldmouse, guinea pig, ewe, has been investigated either by intralymphal or intraperitoneal, injection, and by forced ingestion of a blood suspension and of fat body of diseased white grubs, or by free ingestion. A special attention was given to the Scarabeids in which two groups may be distinguished: the Melolonthidae, Rutelidae, Lucanidae group in which the larvae are infected by the Rickettsia in the same way as in the Melolontha, with an abundant intracytoplasmic multiplication of the rickettsiae elements, and formation of crystals; the Cetoniidae and Dynastidae group in which the larvae are killed following a sequence process or toxemia, without developing a marked rickettsia infection. In the Coleoptera of other families (Calosoma sycophanta, Agriotes sp., Tenebrio molitor, Leptinotarsa decemlineata) and in the Lepidoptera (Pieris brassicae, Mamestra brassicae, Bombyx mori, Galleria mellonella) and the Diptera (Tipula paludosa) investigated, the two kinds of reactions have been observed according to the species. Some of them, such as the larvae of L. decemlineata, B. mori, G. mellonella may allow the R. melolonthae multiplication, others such as P. brassicae and M. brassicae are subject to an occult rickettsiosis transmissible to the progeny and which induces a mortality by a sequence of diseases. With regard to the vertebrates, the culture trials on the vitelline membrane of the chick embryo have not succeeded. After inhalation the white mouse is affected by a pneumonia, followed by a recovery in most cases; by intraperitoneal injection the disease often induces the death, but no abortion. Such phenomena are noticed in the guinea pig, while the ewe develop numerous antibodies after injection. From the experiments carried out with fieldmice fed with diseased white grubs, these animals do not seem to be spreading agents of the germ in the field. This variability of the pathological reactions of the insects and of the vertebrates and this lack of strict specificity of R. melolonthae is a handicap for the eventual use of this microorganism in the white grubs control.

Journal

Annales de la Société entomologique de France (N S ) – Taylor & Francis

Published: Apr 30, 1971

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