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Some aspects of the action of a juvenoid on the growth of Heliothis armigera Hbn. (Lep.: Noctuidae)
Author(s) -
Fytizas E.,
Mourikis P. A.
Publication year - 1981
Publication title -
zeitschrift für angewandte entomologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0044-2240
DOI - 10.1111/j.1439-0418.1981.tb01668.x
Subject(s) - noctuidae , biology , instar , larva , zoology , microbiology and biotechnology , botany
An experiment was carried out on the comparative oxygen consumption and carbon dioxide output of Heliothis armigera larvae treated with a juvenoid and untreated ones. Last instar larvae were treated topically every 2 at low concentration; the oxygen uptake was measured according to the direct Warburg method and the carbon dioxide release with an I.R. gas analyzer. From the data we obtained one can conclude that the gaseous exchange was slightly stimulated during the first 5 d and severely reduced 15 d later. No indication of a hypermetabolic phenomenon is backed by our findings during the period of the spectacular increase of the body weight. On the contrary, hypometabolism is obvious 20 d after the treatment started and one can conclude that the so long survival of the treated larvae might be explained by the hypothesis that larval activity and requirements are limited to such an extend that is adequate for its life needs. Zusammenfassung Zur Wirkung des Juvenoids ZR‐619 auf das Wachstum von Heliothis armigera Hbn. (Lep., Noctuidae). III. Sauerstoffverbrauch und Kohlendioxydabgabe Nach topikaler Behandlung erwachsener Raupen von H. armigera mit ZR‐619 war der Gasaustausch in den ersten 5 d leicht erhöht, danach erheblich vermindert. Die Ergebnisse ließen keine Anzeichen für hypermetabolische Erscheinungen während der Periode der stärksten Zunahme des Körpergewichts erkennen. Im Gegenteil, wurde der Hypermetabolismus 20 d nach Behandlung sichtbar. Ein so langes überleben der behandelten Raupen kann damit erklärt werden, daß die Aktivität und Bedürfnisse der Raupen in einem den Lebensnotwendigkeiten adäquaten Maß begrenzt sind.

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