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Effects of cyromazine on the mechanical properties of the larval integument of Lucilia cuprina (Diptera: Calliphoridae)

Published online by Cambridge University Press:  10 July 2009

A. C. Kotze  and
S. E. Reynolds
A. C. Kotze*
Affiliation:
Biological and Chemical Research Institute, NSW Agriculture, Rydalmere, Australia
S. E. Reynolds
Affiliation:
School of Biological Sciences, University of Bath, Claverton Down, Bath, United Kingdom
*
BCRI, NSW Agriculture, PMB 10, Rydalmere, NSW 2116, Australia.
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Abstract

The effect of cyromazine on the mechanical properties of the larval integument of Lucilia cuprina (Wiedemann) was measured using third instar larvae 2–3 h after moulting placed on liver containing 1 ppm cyromazine. Cuticle stiffness (Δ force (N)/δ strain) was approximately 20–30% higher in treated larvae (relative to controls) after 6–10 h treatment, after which time stiffness decreased to levels well below controls. Larvae placed on 1 ppm cyromazine early in the second instar also showed a short period of slightly elevated cuticle stiffness (relative to controls) after 3–5 h treatment. Third instar larvae placed on cyromazine-treated diet for 8 h then transferred to normal diet showed the same short period of elevated stiffness (at 6–10 h) followed by rapid decrease in stiffness to levels well below controls and greatly reduced growth as larvae fed cyromazine continually. A slight increase in cuticle stiffness appears to be only an early and temporary effect of cyromazine poisoning in L. cuprina. These results are discussed in relation to the previously documented effects of cyromazine on the mechanical properties of the larval cuticle of Manduca sexta (Linnaeus).

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 83 , Issue 3 , September 1993 , pp. 389 - 393
Copyright
Copyright © Cambridge University Press 1993

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