FU Berlin Digitale Dissertation
Muna Abdelaziz Mohamed : The Potential of a Juvenile Hormone Analogue and a Chitin Synthesis Inhibitor to Control Subterranean Termites "Das Potential eines Juvenilhormon-Analogons und eines Chitinsynthesehemmers zur Kontrolle von erdbewohnenden Termiten"
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Abstract Introduction Termites feeding on woody materials inflict considerable damage to crops, forests and buildings. Current control of termites focuses on integrated pest management. Potential biocides for the impregnation of baits are IGRs and especially juvenile hormone analogues (JHAs) and chitin synthesis inhibitors (CSIs). They have no impact on the environment. In the present study, the impact of fenoxycarb (a JHA) and flufenoxuron (a chitin synthesis inhibitor) was studied The general effect of fenoxycarb on termites Fenoxycarb is not repellent or toxic at all concentrations tested in the laboratory (0.3 - 32 ppm). It rather induces differentiation of workers to presoldiers. It can be transferred between nest mates by trophallaxis or grooming. Furthermore, Results showed that fenoxycarb is transported by foragers to the inside of nests and fed to nest mates including the reproductives or deposited into the fungus garden in higher termites. Fenoxycarb has a negative influence on fecundity of termites and on survival of termite larvae The general effect of flufenoxuron on termites Flufenoxuron is toxic to R. santonensis at concentrations higher than 10 ppm but has no feeding deterrent at all concentrations tested in the laboratory (0.2-20 ppm). It demonstrated the inhibition of formation of chitin during the moulting of workers. Synergistic effect of fenoxycarb and flufenoxuron In combination, both compounds act synergistically. This synergism between fenoxycarb and flufenoxuron is probably due to induction of moulting from worker to presoldier by fenoxycarb and the prevention to successfully complete this moulting by flufenoxuron. Conclusion In conclusion, the JHA fenoxycarb and the CSI flufenoxuron, alone or in combination, are promising candidates for the control of termites and may provide alternatives to conventional termite control strategies in the future.

Table of Contents Download the whole PhDthesis as a zip-tar file or as zip-File For download in PDF format click the chapter title Inhaltsverzeichnis Titelseite 1. Introduction 1 1.1 General biology of termites 1 1.2 Termites as pests 5 1.3 Insect growth regulators for termite control 5 2. Materials and methods 9 2.1 Material 9 2.2 Laboratory experiments 10 2.3 The effect of fenoxycarb on laboratory colonies 17 2.4 Acceptance of fenoxycarb and flufenoxuron in the field 18 3 Results 21 3.1 The effect of fenoxycarb on R. santonensis 21 3.2 Quantity of fenoxycarb in workers after different treatments 37 3.3 The effect of flufenoxuron on R. santonensis 43 3.4 Combined treatment using fenoxycarb and flufenoxuron 46 3.5 The effect of fenoxycarb on laboratory colonies 54 3.6 Acceptance of fenoxycarb and flufenoxuron by Microterme species in the field 58 4. Discussion 61 4.1 Chemical control of termites 61 4.2 The effect of fenoxycarb on R. santonensis workers 64 4.3 The effect of flufenoxuron on R. santonensis workers 71 4.4 The effect of combined fenoxycarb and flufenoxuron on R. santonensis 72 4.5 Acceptance of fenoxycarb and flufenoxuron to Microtermes species in the field 74 4.6 Proposed control method for termites using fenoxycarb and flufenoxuron 75 5. Summary 79 6. Zusammenfassung 82 7. References 86 Appendix Acknowledgements

More Information:
Online available:	http://www.diss.fu-berlin.de/2002/187/indexe.html
Language of PhDThesis:	english
Keywords:	Fenoxycarb, Flufenoxuron, Termites, control and IGRS
DNB-Sachgruppe:	32 Biologie
Date of disputation:	16-Jul-2002
PhDThesis from:	Fachbereich Biologie, Chemie, Pharmazie, Freie Universität Berlin
First Referee:	PD Dr. Horst Hertel
Second Referee:	Prof. Dr. Monika Hilker
Contact (Author):	muna.mohamed@bam.de
Date created:	10-Sep-2002
Date available:	11-Sep-2002

 

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