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The influence of the juvenile hormone analogue ZR 512 (Zoecon) on caste development inZootermopsis nevadensis (Hagen) (Isoptera)

Der Einfluss des Juvenilhormon-Analogons ZR 512 (Zoecon) auf die Kastenbildung bei Zootermopsis nevadensis(Hagen) (Isoptera)

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Summary

The juvenile hormone analogue, ethyl 3,7,11-trimethyl-dodeca-2,4-dienoate (ZR 512), can affect all the steps of caste development in the termite,Zootermopsis nevadensis.

The formation of replacement reproductives in orphaned groups of larvae and nymphs, and that of alates in groups of last instar numphs, was inhibited by the exposure of these groups to the vapour of low doses of the juvenile hormone analogue. With intermediate doses of the analogue on groups of last instar nymphs, mainly nymph-imago intermediate forms as well as stationary moults were obtained. High doses of the JH analogue induced regressive and presoldier development in groups of last instar nymphs, and presoldier development in groups of larvae.

It was also demonstrated that ZR 512 affects the prothoracic glands of the experimental larvae.

It is concluded that caste development inZ. nevadensis depends on the juvenile hormone titer during the moulting interval of the larvae and nymphs.

Zusammenfassung

Das Juvenilhormon-Analogon, Aethyl-3,7,11-Trimethyl-Dodeca-2,4-Dienoat (ZR 512) kann alle Schritte der Kastenbildung bei der TermiteZootermopsis nevadensis beeinlussen.

Die Bildung von Ersatzgeschlechtstieren in verwaisten Gruppen von Larven und Nymphen und die Entwicklung von Geflügelten in Gruppen von Nymphen des letzten Stadiums wurden durch niedrige Dosen von ZR 512-Gas gehemmt. Bei Behandlung von Gruppen von Nymphen des letzten Stadiums mit mittleren Dosen des Juvenilhormon-Analogons entstanden hauptsächlich Nymphen-Imago-Zwischenformen oder nach stationären Häutungen wieder Nymphen. Hohe Dosen von ZR 512 bewirkten regressive Häutungen und Vorsoldatenentwicklung in Gruppen von Nymphen des letzten Stadiums und in einem sehr hohen Prozentsatz Vorsoldatenbildung in Gruppen von Larven.

Es konnte auch gezeigt werden, dass ZR 512 die Prothorakaldrüsen der behandelten Larven beeinflusst und auch ihre Degeneration herbeiführen kann.

Aus den Ergebnissen lässt sich ableiten, dass die Differenzierung der Kasten beiZootermopsis nevadensis vom Juvenilhormon-Titer während des Häutungsintervalls der Larven und Nymphen abhängt.

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Wanyonyi, K. The influence of the juvenile hormone analogue ZR 512 (Zoecon) on caste development inZootermopsis nevadensis (Hagen) (Isoptera). Ins. Soc 21, 35–44 (1974). https://doi.org/10.1007/BF02222978

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