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- W2063025237 abstract "Abstract To determine the effects of juvenoids on the development and sensitivity of the southern pine beetle (SPB), Dendroctonus frontalis Zimm., we treated last‐instar larvae, pupae, and callow adults with methoprene, a potent juvenile hormone analogue. From this study we identified a number of juvenoid effects on SPB. Methoprene has the greatest effect on last‐instar larvae and on pupae when it has been applied within 24 hours after pupation. Methoprene either stopped developmental progress of C‐shaped larvae or produced pupal‐adult intermediates from post‐feeding and prepupal larvae that pupated normally. The mean effective dose for 50% adult juvenilization of day‐old pupae was 0.16 ng. Methoprene treatment of older pupae and callow adults significantly reduced the percentage of fully pigmented adults produced. The pupal bioassay should be useful in determining the presence and effects of pine‐produced juvenoids on SPB. Zusammenfassung Über den Einfluß des Juvenilhormon‐Analogons methopren auf die Entwicklung von Dendroctonus frontalis Zimm. (Col., Scolytidae) Zur Bestimmung der Wirkungen von Jovenoiden auf die Entwicklung und Empfindlickeit des Südkiefern‐Borkenkäfers Dendroctonus frontailis wurden Altlarven, Puppen und unreife Käfer mit Methopren, einem Juvenilhormon‐Analogon, behandelt. Aus diesen Untersuchugen ergab sich eine Anzahl von Juvenoid‐Wirkungen auf D. Frontailis. zeigte die Stärkste Wirkung auf erwachsene Larven sowie auf Puppen innerhalb von 25 h nach der Verpuppung. Es stoppte entweder den Entwicklungsprozeß der Larven oder produzierte Puppen/Adulte‐Zwischenformen bei den Spätfressenden und Vorpuppen‐Larven, Welche normal zur Verpuppung kamen. Die mittlere wirksame Dosis für 50%ige Adulte‐Juvenilisation von 1 d alten Puppen betrung 0,16 ng. Die Methopren‐Behandlung von älteren Puppen und unreifen Adulten verringerte signifikant den Prozentsatz vollpigmentierter Adulter. Die Behandlung der Puppen Könnte nützlich zur Bestimmung der Anwesenheit und Wirkung Kiefernbürtiger Juvenoide von D. frontalis sein." @default.
- W2063025237 created "2016-06-24" @default.
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- W2063025237 date "1980-01-12" @default.
- W2063025237 modified "2023-10-17" @default.
- W2063025237 title "Influence of the juvenile hormone analogue, methoprene1, on development of the southern pine beetle, Dendroctonus frontalis Zimm. (Col., Scolytidae)" @default.
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- W2063025237 doi "https://doi.org/10.1111/j.1439-0418.1980.tb03489.x" @default.
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