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ADAPTIVE SIGNIFICANCE OF DENSITY-DEPENDENT BALLOONING BY BAGWORM LARVAE, METISA PLANA (WALKER) (LEPIDOPTERA: PSYCHIDAE)

Published online by Cambridge University Press:  31 May 2012

Marc Rhainds ,
Gerhard Gries  and
Poh Son Chew
Marc Rhainds
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnahy, British Colombia, Canada V5A 1S6
Gerhard Gries*
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnahy, British Colombia, Canada V5A 1S6
Poh Son Chew
Affiliation:
Applied Agricultural Research Sdn. Bhd., Sg. Buloh, Selangor, Malaysia
*
1Author to whom all correspondences hould be addressed.
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Abstract

Experiments conducted in a plantation of oil palms, Elaeis guineensis (Jacquin), infested with bagworms, Metisa plana (Walker), tested the hypotheses that crowding enhances the incidence of larval ballooning and negatively affects the size attained by pupae. Proportions of ballooning larvae increased with increasing densities of larvae per palm. The lengths of bags (and pupal cases) decreased with increasing numbers of bagworms per leaf. Ballooning of larvae from crowded palms is likely adaptive because individuals attaining large size at pupation have proportionately greatest survival, mating success, and fecundity.

Résumé

Des expériences conduites dans une plantation de palmiers à huile, Elaeis guineensis (Jacquin), infestés par le psychide, Metisa plana (Walker), ont démontré que des densités accrues de population augmentent la fréquence de dispersion aérienne par les larves et réduisent la taille des pupes. La dispersion aérienne des larves depuis les palmiers densément peuplés augmente leur succès reproducteur parce que la survie, le succès d’accouplement et la fécondité augmentent avec la taille des pupes.

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 5 , October 1997 , pp. 927 - 931
Copyright
Copyright © Entomological Society of Canada 1997

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