Do fecal shields provide physical protection to larvae of the tortoise beetles Plagiometriona flavescens and Stolas chalybea against natural enemies?

  • Flávia Nogueira-de-Sá
  • José Roberto Trigo
Conference paper

DOI: 10.1007/978-94-017-2776-1_23

Part of the Series Entomologica book series (SENT, volume 57)
Cite this paper as:
Nogueira-de-Sá F., Trigo J.R. (2002) Do fecal shields provide physical protection to larvae of the tortoise beetles Plagiometriona flavescens and Stolas chalybea against natural enemies?. In: Nielsen J.K., Kjær C., Schoonhoven L.M. (eds) Proceedings of the 11th International Symposium on Insect-Plant Relationships. Series Entomologica, vol 57. Springer, Dordrecht

Abstract

During their larval phase, Plagiometriona flavescens(Boheman, 1855) and Stolas chalybea (Germar, 1824) (Chrysomelidae: Cassidinae), carry masses of feces and exuviae on their back called fecal shield, and it is suggested to protect larvae against natural enemies. We investigated if the physical barrier provided by the shield plays any role in the defense of these larvae. We conducted a field experiment checking the mortality of larvae of both species with their natural shields substituted by an artificial shield, with shields removed and with their shields intact. Mortality controls for each of the 3 shield treatments were carried out on host plants protected against natural enemies. On both species we observed that larvae with their shields intact had a significant lower mortality proportion than larvae with artificial shields or without shields. Control larvae on protected plants had low mortality. Our results agree with literature data, showing that fecal shields do not provide a physical protection to larvae but are important in their defense, probably due to the chemicals present in them.

Key words

Cassidinae Chrysomelidae Aureliana fasciculata Solanaceae Calea pinnatifida Asteraceae physical protection chemical protection predation 

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Copyright information

© Springer Science+Business Media Dordrecht 2002

Authors and Affiliations

  • Flávia Nogueira-de-Sá
    • 1
  • José Roberto Trigo
    • 1
  1. 1.Laboratorio de Ecologia Química, Departamento de Zoologia, Instituto de BiologiaUniversidade Estadual de CampinasCampinasBrazil

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