EJE, vol. 94 (1997), issue 2

Biological effects of muristerone A and turkesterone on the epithelial cell line from Chironomus tentans (Diptera: Chironomidae) and correlation with binding affinity to the ecdysteroid receptor


Eur. J. Entomol. 94 (2): 161-166, 1997

Ecdysteroids, which possess an alpha-hydroxyl group at C11, bind with about the same affinity to the ecdysteroid receptor as compared to the corresponding compounds lacking the hydroxyl group. This is shown for turkesterone/20-hydroxyecdysone and muristerone A using receptor preparations from the epithelial cell line from Chironomus tentans. For all compounds tested, the potency to elicit a hormonal response corresponds with the affinity to the ecdysteroid receptor as determined by induction of acetylcholinesterase, a marker enzyme for cell differentiation.

Distribution, stability and binding specificity of a hemagglutinin in the corn earworm, Helicoverpa zea (Lepidoptera: Noctuidae)


Eur. J. Entomol. 94 (2): 167-176, 1997

A hemagglutinin (HA) was detected during all developmental stages of the corn earworm Helicoverpa zea. The HA titer was relatively low at the onset of each developmental stage; it increased very rapidly during each stage and declined considerably just before the onset of the next. The highest HA titer of 4,096 was attained during days 3-5 of fifth-instar larvae. In contrast, the lowest titer of 8 was obtained in adult insects. Female pupal and adult H. zea had higher HA titers than their male cohorts. The hemagglutinin agglutinated red blood cells (RBCs) from a broad range of animals. Its binding specificity was unusual in that the hemagglutination...

Deuterium oxide prevents expression of a diapause maternal effect in the flesh fly, Sarcophaga bullata (Diptera: Sarcophagidae), and alters development and fecundity


Eur. J. Entomol. 94 (2): 177-182, 1997

A maternal effect that operates in Sarcophaga bullata normally prevents expression of pupal diapause in progeny of females that are reared under short days. Thus, only the progeny from females reared under long daylength can respond to short daylength by entering pupal diapause. When 20% deuterium oxide (D2O) was added to the larval diet, the diapause fate of the flies was reversed: progeny from long-day females failed to diapause in response to short days, and some progeny from shea-day females entered diapause. The diapause fate of the subsequent generation was also affected. Progeny from females reared on the 20% D2O...

Hormonally mediated insect-plant relationships: Arthropod populations associated with ecdysteroid-containing plant, Leuzea carthamoides (Asteraceae)


Eur. J. Entomol. 94 (2): 183-198, 1997

An extensive zoocenotic study of arthropod populations was performed on a Siberian plant Leuzea carthamoides, which was recently introduced to Central Europe as a medicinal crop. Because it contains a very high concentration of insect hormones (ecdysteroids) (300-1,000 ppm of 20-hydroxyecdysone equivalents in the leaves), the plant was thought to be resistant to attack by non-adapted arthropod herbivores (effective concentrations 25-100 ppm in insect diet). Two consecutive seasons of analysis revealed that, in spite of the high ecdysteroid content, the crops of L. carthamoides contained a well-established and consolidated arthropod fauna....

Visual and olfactory behaviour of Delia antiqua (Diptera: Anthomyiidae) in relation to time of day and ovarian development


Eur. J. Entomol. 94 (2): 199-209, 1997

Visual and olfactory responses of onion maggot flies (OMF), Delia antiqua (Meigen), to food and oviposition resources in relation to sex, ovarian development, and time of day, were evaluated in a commercial onion field in Cloverdale, British Columbia, using horizontal coloured sticky traps baited with the oviposition attractant dipropyl-disulphide (DPDS) or feeding attractant, enzymatic yeast hydrolysate (EYH). White and blue were among the most attractive colours to both males and females, but the sex ratio was strongly male-biased (2.7 : 1). Both olfactory baits increased catches of male OMF on all coloured traps to the same extent but neither...

Book Review: Urban Entomology. Insect and Mite Pests in the Human Environment.


Eur. J. Entomol. 94 (2): 210, 1997

Robinson W.H.: Urban Entomology. Insect and Mite Pests in the Human Environment. Chapman & Hall, London, UK, 1996, 430 pp.

Foraging behaviour and resource utilization of the aphid parasitoid, Pauesia pini (Hymenoptera: Aphidiidae) on spruce: Influence of host species and ant attendance


Eur. J. Entomol. 94 (2): 211-220, 1997

 We examined the foraging behaviour of the aphid parasitoid Pauesia pini (Haliday) (Hymenoptera: Aphidiidae) when foraging for Cinara piceicola (Cholodkovsky) or Cinara pilicornis (Hartig) (Hemiptera: Aphididae) on spruce. The foraging success of P. pini females differed for the two host species but depended also on the hosts' morph as well as on the presence of honeydew-collecting workers of Formica polyctena (Hymenoptera: Formicidae). Females found most hosts and laid most eggs when searching for C. picieicola-VI morphs feeding on the stem. There, they succeeded in laying more eggs into ant-attended...

Are behavioural changes in parasitised aphids a protection against hyperparasitism?


Eur. J. Entomol. 94 (2): 221-234, 1997

Parasitised aphids often leave the aphid colony before mummification. It has been suggested that this behaviour is an example of host manipulation by the primary aphidiid parasitoid to reduce the risk of hyperparasitism after mummy formation. Mummification site and hyperparasitism risk are surveyed in 16 species of aphid. Mummification away from the colony was not associated with reduced hyperparasitism. In ant-attended species, and in species with well developed parasitoid defence behaviour (such as kicking), mummies formed within the colony tended to suffer less hyperparasitism. In laboratory experiments, two hymenopteran ectohyperparasitoids, Dendrocerus...

Temperature adaptations of Siberian Pterostichus species (Coleoptera: Carabidae)


Eur. J. Entomol. 94 (2): 235-242, 1997

Thermopreferenda and supercooling points of the following Siberian species of Carabidae were examined: Pterostichus vermiculosus, P. montanus, P. brevicornis, P. kaninensis, P. dilutipes, P. subaeneus (= wagneri), P. ehnbergi, P. magus and P. drescheri.

Thermopreferenda of the different species were invariable over their area of distribution and correlated with their distribution within natural zones and altitudinal bells. Species examined had no seasonal changes of thermopreferenda. Instar specific thermopreferenda were observed.
The species examined demonstrated slight...

Do spiders (Araneae) feed on rose leafhopper (Edwardsiana rosae; Auchenorrhyncha: Cicadellidae) pests of apple trees?


Eur. J. Entomol. 94 (2): 243-251, 1997

We evaluated the ability of Philodromidae and Salticidae, the two spider families most commonly found in commercial apple orchards of Massachusetts, to feed on rose leafhoppers, Edwardsiana rosae (L.), important pests of apple foliage. We conducted two different laboratory feeding tests: a leaf test (in which individual spiders were exposed to leafhopper nymphs and adults on single leaves within paper cups for 72 h) and a branch test (similar to the leaf test but foliage on netted branches was used). Controls consisted of cups with leaves or netted branches and leafhoppers but without spiders. In both tests, we found more dead leafhoppers when...

Book Review: Insect Natural Enemies. Practical Approaches to Their Study and Evaluation.


Eur. J. Entomol. 94 (2): 251-252, 1997

Jervis M. & Kidd N. (eds): Insect Natural Enemies. Practical Approaches to Their Study and Evaluation. Chapman & Hall, London, UK, 1995, 491 pp.

Damage threshold for Thrips tabaci (Thysanoptera: Thripidae) in monocropped and intercropped leek


Eur. J. Entomol. 94 (2): 253-261, 1997

Based on field data collected during three consecutive years, in experiments with leek and leek intercropped with subterranean clover (Trifolium subterraneum), the relationship between larval populations of Thrips tabaci on leeks, the level of injury and the market quality of the product were described. This resulted in a way to monitor both thrips populations and market quality during the growing season by the feeding symptoms and in damage thresholds in monocropped and intercropped leeks. It was found that a given number of thrips larvae per plant caused less injury on intercropped leek plants than on monocropped leeks. This proved...

Book Review: Kleinschmetterlinge Oder Microlepidoptera IV. Flachleibmotten (Depressariidae).


Eur. J. Entomol. 94 (2): 262, 1997

Hannemann H.-J.: Kleinschmetterlinge Oder Microlepidoptera IV. Flachleibmotten (Depressariidae). Die Tierwelt Deutschlands, 69. Teil. G. Fischer Verlag, Jena, Stuttgart, 1995, 192 pp., 86 Figs, 88 Maps, 13 Tables.

The formation of accessory tubules in spermatids of the red firebug, Pyrrhocoris apterus (Hemiptera: Pyrrhocoridae)


Eur. J. Entomol. 94 (2): 263-270, 1997

Sperm of most insects are characterized by the presence of a 9 + 9 + 2 pattern of microtubules. In the present fine structure study, the development of the accessory tubules is described in spermatids of Pyrrhocoris apterus using transmission electron microscopy of ultrathin sections. The first step in the assembly of the accessory tubules consisted in the formation of hook-shaped protofilament ribbons attached to the B-tubules of the axoneme. Subsequently the protofilament ribbons detached from the B-tubules and formed individual accessory tubules. This mode of formation of accessory tubules has been described previously in Orthoptera, Plecoptera,...

Sperm transfer during copulation in five Coproica species (Diptera: Sphaeroceridae)


Eur. J. Entomol. 94 (2): 271-286, 1997

Sperm transfer in five Coproica Rondani was studied by separating copulating pairs at varying time intervals from the onset of copulation. In Coproica ferruginata (Stenhammar), C. hirticula (Collin), C. lugubris (Haliday), and C. vagans (Haliday) rapid sperm transfer, which occurs shortly before the termination of copulation, is preceded by a preinsemination phase of species-specific duration. In C. acutangula (Zetterstedt) sperm transfer starts soon after the initiation of copulation and is accomplished slowly. At the beginning of copulation a tight fit of the secondary male gonopore or phallotreme and the...

New fossil Sisyridae and Nevrorthidae (Insecta: Neuroptera) from Eocene Baltic amber and Upper Miocene of France


Eur. J. Entomol. 94 (2): 287-294, 1997

A new species of Sisyra is described but not named from the Upper Miocene of France. The study of a new find of Rophalis relicta Hagen, 1856 from Baltic amber (Upper Eocene) shows that it is not a sisyrid but a nevrorthid; however, the genital apparatus of the genus Rophalis is atypical of this family compared with Recent genera.

The genus Cardiochiles (Hymenoptera: Braconidae) in the Iberian Peninsula


Eur. J. Entomol. 94 (2): 295-300, 1997

The genus Cardiochiles is rare in Europe, with only two species having been recorded from the Spanish fauna: C. robustus and C. saltator. In this paper, two additional species of this genus are studied from the Iberian Peninsula: C. desertus is recorded for the first time and Cardiochiles pappi is described as a new species.

Trichogramma danubiense sp. n. (Hymenoptera: Trichogrammatidae), an egg parasitoid of Macrothylacia rubi (Lepidoptera: Lasiocampidae), with some data on its bionomics


Eur. J. Entomol. 94 (2): 301-306, 1997

Trichogramma danubiense sp.n., an ooparasitoid of eggs of Macrothylacia rubi is described, collected from Prunus cerasus in SW Slovakia. In the laboratory, the species could reproduce in eggs of Mamestra brassicae and Ephestia kuehniella. It can be distinguished from the related T. lingulatum Pang & Chen by an incision on the apex of the dorsal expansion of the gonobase. T. danubiense is arrhenotokous in laboratory conditions (22°C, 55% RH, 16L : 8D). The females obtained from eggs of M. rubi lived 2-14 days, their average fecundity was 262 (maximum 323) progeny and the percentage of males...

Single-step immunoaffinity purification of the neuropeptide sericotropin using polyclonal antibodies towards the synthetic N-terminal fragment of the molecule


Eur. J. Entomol. 94 (2): 307-309, 1997

An immunoaffinity chromatography of the neuropeptide sericotropin using rabbit polyclonal antibodies towards the 16 amino acids synthetic fragment of the molecule was used for the purification of the peptide from Galleria mellonella larval brains. The method employed CNBr-activated Sepharose and the isolated IgG fraction of the corresponding antiserum. The purity of the peptide was proven by means of HPLC and immunoblotting techniques.

Allozyme polymorphism in a natural population of Chrysoperla carnea sensu lato (Neuroptera: Chrysopidae): A contribution to the status of the constitutive taxons in western Europe


Eur. J. Entomol. 94 (2): 311-316, 1997

In recent years, several sibling species have been discovered in chrysopid lacewings. In Europe, the common green lacewing Chrysoperla carnea (Stephens) sensu lato seems to correspond to a ''complex'' of three morphologically and biologically different taxons: Ch. carnea sensu stricto, Ch. kolthoffi (Navás) and Ch. lucasina (Lacroix), the status of which is not yet fully clarified. We examined, by means of polyacrylamide gel electrophoresis, the esterase and acid phosphatase polymorphism in a natural population of the Chrysoperla complex collected in the centre of France. Five groups of esterases and two groups of...

Coccinellidae (Coleoptera) as vectors of mites


Eur. J. Entomol. 94 (2): 317-319, 1997

Mites carried by coccinellid beetles have been found to be important predators of scale insects. To investigate the possible wider importance of coccinellids as vectors of mites, we undertook a survey of the range of mites carried by coccinellids in one location in the United Kingdom. Deutonymphs of six species of mite were found phoretic upon coccinellids, and one species was observed that was parasitic. The importance of these observations awaits further study on the biology and ecology of the mite concerned. It is clear, however, that introduction of coccinellids to an environment will be accompanied by the introduction of mites.