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  • 1
    Electronic Resource
    Electronic Resource
    Effects of selected physical and chemical treatments of Colorado potato beetle eggs on host acceptance and development of the parasitic wasp, Edovum puttleri (1999)
    Springer
    Entomologia experimentalis et applicata 90 (1999), S. 237-245 
    Details
    ISSN: 1570-7458
    Keywords: physical and chemical effects ; parasitization ; Colorado potato beetle ; Leptinotarsa decemlineata ; Coleoptera ; Chrysomelidae ; Edovum puttleri ; Hymenoptera ; Eulophidae ; UV irradiation ; host age ; freezing ; kairomone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Effects of various physical and chemical treatments of Colorado potato beetle [Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)] eggs on parasitization and development of the egg parasitoid Edovum puttleri (Hymenoptera: Eulophidae) were investigated. UV irradiation did not affect host acceptance but reduced host suitability for UV exposure times ≥90 min. Susceptibility of host eggs to UV irradiation varied with host age; eggs were most vulnerable to damage from irradiation at 12, 18, and 24 h post-oviposition. The rate of parasitization also was influenced by host age. Percent parasitization was greatest in freshly laid eggs and 24–30 h old eggs. Seventy-seven percent of host eggs frozen at −20 °C (5 min) were parasitized by E. puttleri, but extended exposure of eggs to −20 °C reduced both acceptance and suitability. Host eggs that had been washed with hexane (removal of kairomone and sticky layer) also were parasitized. After 5 min of washing, application of kairomone significantly increased the rate of parasitism (from 74.7% to 88.2%), but with longer periods of washing, kairomone application had no significant effect on percent parasitism. Thus, the sticky material(s) coating the egg did not appear to be essential for parasitization to occur. Our results provide effective methods and times for treating Colorado potato beetle eggs to maximize parasitization and development of E. puttleri.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026425813762
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  • 2
    Electronic Resource
    Electronic Resource
    Ecdysteroid profiles for hemolymph and testes from larvae, pupae, and pharate adults of the European corn borer, Ostrinia nubilalis hubner (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 7 (1988), S. 267-279 
    Details
    ISSN: 0739-4462
    Keywords: ecdysteroid titers ; ecdysone ; 20-hydroxyecdysone ; 26-hydroxyecdysone ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Total ecdysteroid levels as well as concentrations of several individual ecdysteroids were determined for hemolymph and testes of fifth instars, pupae, and pharate adults of the European corn borer, Ostrinia nubilalis (Hubner). For total levels, the patterns of fluctuation in hemolymph and testes were similar, but the concentrations in testes were lower than those in hemolymph. In both hemolymph and testes there were two ecdysteroid peaks: the first just prior to the formation of the pharate pupa, the second just prior to the formation of the pharate adult.An examination of ecdysteroid profiles revealed some important differences. Ecdysone was either absent or present at extremely low levels in larval testes, whereas in hemolymph there was a premolt ecdysone peak. In pupal testes, ecdysone was present, but levels of 26-hydroxyecdysone were much lower than those in hemolymph. Thus, in regard to ecdysteroids, testes have the ability to control their own internal milieu.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940070405
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    Paper (German National Licenses)
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