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Sex Pheromone of Ascogaster quadridentata, a Parasitoid of Cydia pomonella (1999)

DeLury, Naomi C. ; Gries, Gerhard ; Gries, Regine ; [et al.]

Springer

Journal of chemical ecology 25 (1999), S. 2229-2245

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ISSN: 1573-1561

Keywords: Sex pheromone ; parasitoid ; Ascogaster quadridentata ; Cydia pomonella ; (Z,Z)-9,12-octadecadienal ; (Z)-9-hexadecenal ; 3,7,11-trimethyl-6E,10-dodecadienal ; dihydrofarnesal ; Braconidae ; Tortricidae

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract Porapak Q volatile extracts of female Ascogaster quadridentata, an egg-larval endoparasitoid of codling moth, Cydia pomonella, bioassayed in Y-tube olfactometers attracted male, but not female, A. quadridentata. Coupled gas chromatographic–electroantennographic detection (GC-EAD) analysis of bioactive extracts revealed three compounds that elicited responses by male A. quadridentata antennae. GC-mass spectra (MS) indicated, and comparative analyses of authentic standards confirmed, that these compounds were (Z,Z)-9,12-octadecadienal, (Z)-9-hexadecenal, and 3,7,11-trimethyl-6E,10-dodecadienal. (Z,Z)-9,12-Octadecadienal alone attracted laboratory-reared male A. quadridentata in Y-tube olfactometer and field-cage bioassays, and attracted feral A. quadridentata in a field experiment. This sex pheromone could be used to help detect populations of A. quadridentata, delineate their distributions, and determine potential sources of parasitoids for capture and release in integrated programs for control of C. pomonella.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1020813621977

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Physiological relationship between a diapausing endoparasitoid (Ascogaster quadridentata) and its dormant host (Cydia pomonella) (1990)

Brown, John J. ; Reed-Larsen, Darcy ; Ahl, Joanna

New York, NY [u.a.] : Wiley-Blackwell

Archives of Insect Biochemistry and Physiology 13 (1990), S. 229-238

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ISSN: 0739-4462

Keywords: Braconidae ; Tortricidae ; methoprene ; juvenile hormone ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology

Notes: The facultative diapause of Ascogaster quadridentata depends upon the photoperiod experienced by its host. A host exposed to short day lengths (12L:12D) ceases development in its fourth stadium, spins a cocoon, and remains dormant throughout the winter. A first stadium parasitoid larva overwinters in a true diapause, within its dormant host.Dormancy of both animals is due to a failure of the host's endocrine system. Upon transfer of the host from dormancy-maintaining (OL:24D, 4°C) to dormancy-terminating conditions (DTC = 16L:8D, 25°C) a host cephalic factor is released. The cephalic factor blocked by host ligation within 48 h of transfer to DTC was circumvented by an injection of the host with 20-hydroxyecdysone. Parasitoid larvae that were either isolated within the abdomen of 20-hydroxyecdysone-injected hosts or held in vitro with the molting hormone initiated apolysis.An increased titer of hemolymph juvenile hormone, which was present 48 h after the host was transferred to DTC, may have had a prothoracicotropic effect upon the host/parasitoid unit. A topical application of 1 ng of methoprene, concurrent to host transfer to DTC, accelerated parasitoid development. No parasitoid development was evident if the host was neck-ligated at the time of its methoprene treatment and transfer to DTC. These data suggest that the prothoracicotropic effect of methoprene was via the host head, rather than directly on the host prothoracic glands, or the parasitoid itself.

Additional Material: 3 Ill.