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PubMed2001

Data on the host plant selection of the horseradish flea beetle, Phyllotreta armoraciae (Koch, 1803) (Coleoptera, Chrysomelidae, Alticinae).

Crucifer feeding specialists within the Chrysomelidae family can be found mainly in the subfamilies of Chrysomelinae and Alticinae. Nearly all the species of Phyllotreta within Alticinae feed on crucifers or related genera of Resedaceae and Capparaceae. Oligophagy is a characteristic feature of Phyllotreta species but some species are monophagous. Under natural conditions Phyllotreta armoraciae (Koch, 1803) is considered as a monophagous species feeding only on horseradish (Armoracia lapathifolia Usteri). Ph. armoraciae is in fact not monophagous under laboratory conditions. It feeds on several cruciferous plants to the same extent as on horseradish. In our investigation we tried to clarify the host plant selection of Hungarian populations of Ph. armoraciae. Under laboratory conditions no consumption of Capsella bursa-pastoris (L.) Medic., Arabis sp. and Alyssum saxatile L. was observed even under stress conditions. Small amount of Brassica napus L. and Sinapis alba L. while appreciable amount of Barbarea vulgaris R. Br., Brassia nigra (L.) Koch and Alliaria petiolata (M. B.) Cavara et Grande were consumed. There was no significant difference in preference for Brassica nigra and Armoracia lapathifolia.

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PubMed2002

Data on the biology of the crucifer flea beetle, Phyllotreta cruciferae (Goeze, 1777) (Coleoptera, Chrysomelidae, Alticinae).

Biology of Phyllotreta cruciferae (Goeze, 1777) known as serious pest of cruciferous crops in Europe and North America was investigated both in the laboratory and under field conditions in Southwestern Hungary. Adults overwinter under plant debris and appear in large number by the end of April-beginning of May. Eggs are laid from May through spring until mid-July. Larvae can be found from June to mid-October. The pupation lasts until October. The young adults of the new generation appear in August and retire to the overwintering sites by the end of October. There was one generation observed under Hungarian conditions. Considering results annual cycle of Phyllotreta cruciferae (Goeze, 1777) is presented. The average number of eggs deposited by females in laboratory was 200.25 +/- 67.2. Investigations concerning the effect of the temperature on individual's developing time were accomplished under three controlled temperatures. Length of the development under different temperature conditions, the biological zero point and DD value of different developmental stages of Phyllotreta cruciferae (Goeze, 1777) are presented.

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PubMed1992

A flea bite.

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PubMedDate not supplied

[A new species of flea in the genus Ctenophthalmus (Siphonaptera: Hystrichopsyllidae)].

A new species, Ctenophthalmus (Euctenophthalmus) parthicus sp. n., is described from social vole (Microtus socialis Pallas) from four localities of the West Kopetdag Mountains of Turkmenia. The new species is close to C.(E.) secundus Wagner and C.(E.) congener nadimi Farhang-Azad. It differs from males of the other known species by the following characters. The movable process has an infra-acetabular process whose length is the same as the height of its supra-acetabular portion. The movable process has the straight front margin, right anterior apical angle. The anterior part of the dorsal margin of the movable process is elevated, the hind part is slightly concave. The posterior apical angle of the movable process is cut. The hind margin of the movable process is convex. The apex of the distal arm of sternum IX is straight, not oblique. The female differs by the following peculiarities. Sternum VII has a well developed dorsal lobe below which there is a smaller rounded lobe and a distinct small ventral process. Unciform sclerotization of tergum VIII (or the place of connection between tergum VIII and its internal lobe) resembles an arc. The front margin of the internal lobe of tergum VIII is not sclerotized. The bursa copulatrix is as long as the dorsal spines of pronotum.

Animals↗
PubMedDate not supplied

[Experimental interspecific hybridization in fleas of the genus Nosopsyllus (Siphonaptera: Ceratophyllidae)].

Experimental interspecific hybridization between males and females of Nosopsyllus fasciatus and N. mokrzeckyi was carried out. Most abundant progeny was obtained after hybridization between N. fasciatus females and N. mokrzeckyi males. Hybrid descendants inherited, in general, the characters of the maternal species and in less number the paternal characters and those of both parents. The fecundity of hybrid progeny of N. fasciatus females and N. mokrzeckyi males in two generations was studied. A conclusion is made concerning close affinity of the species and their relative evolutionary youth.

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