Mise en évidence d'une activité kairomonale des œufs de la pyrale du maïs sur les femelles deTrichogramma maidis

Renou, Marcel; Hawlitzky, Nicole; Malosse, Christian; Ramiandrasoa, F.

doi:10.1007/bf02374395

Cited by 17 publications

(5 citation statements)

References 13 publications

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“…Several studies demonstrate improved responsiveness of parasitoids to target stimuli merely by providing brief exposure to host‐derived products (Kaiser et al 1989a; Renou et al 1989; Turlings et al 1989; Cortesero & Monge 1994). However, ovipositional experience with a host results in a stronger response to the target stimuli (Papaj & Vet 1990; Bjorksten & Hoffmann 1995).…”

Section: Discussionmentioning

confidence: 99%

Experience acquisition by Trichogramma australicum Girault (Hymenoptera: Trichogrammatidae)

Nurindah

Cribb

Gordh

1999

Australian Journal of Entomology

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We investigated experience acquisition (alpha-conditioning) by females of the parasitoid Trichogramma australicum using host eggs of the noctuid moth Helicoverpa armigera (Hübner). We compared the acceptance of a host egg by females with different levels of ovipositional experience. The level of experience was designated using the standard oviposition sequence: (1) host contact (C); (2) host examination (E); (3) drilling (D); (4) full insertion (FI); and (5) oviposition (O). Each treatment consisted of a single experience level, but together these consituted a qualitative behavioural continuum of oviposition experience from naive (N) to experienced wasps. We found that host experience by adult T. australicum females can modify their behaviour. Mean duration of host finding was: N = C > E = D > FI = O. Mean duration of host examination and full insertion were: N = C > E = D = FI = O. Drilling was constant for all experience levels. Experience in drilling of the chorion during the previous hostexposure process represents a critical experience for a female and results in efficient handling and more ready acceptance of a subsequently encountered host egg.

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Section: Discussionmentioning

confidence: 99%

Experience acquisition by Trichogramma australicum Girault (Hymenoptera: Trichogrammatidae)

Nurindah

Cribb

Gordh

1999

Australian Journal of Entomology

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“…After having demonstrated the attractivity in an olfactometer of extracts from egg masses of the European Corn Borer (Ostrinia nubilalis Hbn.) to female Trichogramma brassicae (Renou et al, 1989), we report in the present paper an identification of the main chemicals found in these extracts and a measure of their kairomonal activity in the laboratory.…”

Section: Introductionmentioning

confidence: 91%

Identification of compounds from the eggs of Ostrinia nubilalis and Mamestra brassicae having kairomone activity on Trichogramma brassicae

Renou¹,

Nagnan²,

Durier

1992

Entomologia Exp Applicata

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In the presence of an extract of Ostrinia nubilalis or Mamestra brassicae eggs, female Trichogramma brassicae exhibited increased rates of upwind locomotion in the tubes of a linear olfactometer. GC and GC‐MS analyses of O. nubilalis and M. brassicae egg extracts revealed the presence of fatty acids, their ethyl esters, and various hydrocarbons. Exposing the wasps to a mixture of the five main saturated hydrocarbons (heneicosane, tricosane, pentacosane, heptacosane and nonacosane) increased the upwind progression in the olfactometer. Single hydrocarbons elicited reduced or no activity. Ethyl palmitate and palmitic acid were also effective in increasing upwind locomotion. Z11‐14: Ac, the main component of the female sex pheromone of O. nubilalis was inactive, regardless of its concentration. It is concluded that various compounds present on the surface of the O. nubilalis egg masses may play a role in the orientation of T. brassicae to its host. Résumé En présence d'un extrait superficiel d'oeufs d'Ostrinia nubilalis, ou de Mamestra brassicae, les femelles du parasitoïde Trichogramma brassicae présentent une tendance accrue à la remontée du tube dans un olfactomètre linéaire. L'analyse des extraits d'oeufs par chromatographie en phase gazeuse couplée à la spectrométrie de masse révèle la présence d'acides gras, de leurs esters éthyliques, et de divers hydrocarbures. Un mélange des principaux hydrocarbures saturés (hénéicosane, tricosane, pentacosane, heptacosane et nonacosane) déclenche également une remontée plus rapide et plus importante du tube. Chacun de ces hydrocarbures pris isolément présente une activité nulle ou réduite. D'autres constituants des extraits, l'acide palmitique et son ester éthylique, présentent également une certaine activité. En revanche, le Z11‐14: Ac, constituant majoritaire de la phéromone sexuelle d'O. nubilalis, est inactif, quelle que soit la dose utilisée. En conclusion, divers constituants présents à la surface des oeufs de la pyrale du maïs modifient le comportement locomoteur de femelles de T. maïdis et pourraient done jouer un rôle dans l'orientation de ce parasitoïde vers son hôte.

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“…The use of volatile host-plant substances in habitat location has been demonstrated by Nordlund et al (1985); host related substances have been reported by, for example, Teal et al (1986) and Shu & Jones (1989). The involvement of substances associated with the host's eggs, the parasitoids' ultimate targets, has been described by e.g., Noldus & Van Lenteren (1985) and Renou et al (1989). Ferreira et al (1979) and Bourarach & Hawlitzky (1984), found that Trichogramma spp.…”

Section: Introductionmentioning

confidence: 97%

Analysing host location in Uscana lariophaga (Hymenoptera: Trichogrammatidae), an egg parasitoid of bruchids (Coleoptera: Bruchidae), using Cox's proportional hazards model

Ormel

Gort

Alebeek

1995

Bull. Entomol. Res.

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Uscana lariophaga Steffan is an egg parasitoid of the bruchid species Callosobruchus maculatus (Fabricius) and Bruchidius atrolineatus Pic in West Africa, which cause damage in stored cowpea (Vigna ungukulata (Leguminosae)). In a no-choice situation, the attractiveness of some odour sources to the parasitoid was studied in a simple diffusion olfactometer. Cox's proportional hazards model was used for data analysis. The results showed that cowpea beans were more attractive to naive U. lariophaga females than glass beads. Baits with host eggs were more attractive than baits without eggs. Experienced females did not perform any better than naive ones. The relationship between the inclination to fly of the parasitoids, and the baits used, was difficult to interpret. Changes in searching activity between the different weeks of experimentation were observed. Only a small part of this variation could be explained by (absolute) changes in barometric pressure.

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Mise en évidence d'une activité kairomonale des œufs de la pyrale du maïs sur les femelles deTrichogramma maidis

Cited by 17 publications

References 13 publications

Experience acquisition by Trichogramma australicum Girault (Hymenoptera: Trichogrammatidae)

Experience acquisition by Trichogramma australicum Girault (Hymenoptera: Trichogrammatidae)

Identification of compounds from the eggs of Ostrinia nubilalis and Mamestra brassicae having kairomone activity on Trichogramma brassicae

Analysing host location in Uscana lariophaga (Hymenoptera: Trichogrammatidae), an egg parasitoid of bruchids (Coleoptera: Bruchidae), using Cox's proportional hazards model

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