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FEEDING BEHAVIOR OF THE ADULT COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA (SAY), ON SOLANUM BERTHAVLTII HAWKES

Published online by Cambridge University Press:  31 May 2012

Yvan Pelletier  and
Zane Smilowitz
Yvan Pelletier
Affiliation:
Pennsylvania State University, Department of Entomology, 106 Patterson Building, University Park, Pennsylvania, USA 16802
Zane Smilowitz
Affiliation:
Pennsylvania State University, Department of Entomology, 106 Patterson Building, University Park, Pennsylvania, USA 16802
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Abstract

The feeding behavior of adult Colorado potato beetles has been studied on leaflets from two clones of Solanum berthaultii Hawkes (PI473340, clones #1726 and #1729) and on S. tuberosum L. var. Norchip leaflets treated with leaf extract from S. berthaultii 1726. Treatment of S. tuberosum leaflet with leaf extract from S. berthaultii 1726 (0.075 mg/cm2 of leaflet) did not modify the behavior of adult Colorado potato beetles even if consumption was reduced. On S. berthaultii 1726, consumption and consumption rate were reduced, the frequency of the “moving” behavior increased, the frequency of the “resting” behavior decreased, and the frequency of the “feeding” behavior did not change compared with S. tuberosum. The antifeedant property of S. berthaultii 1726 probably was perceived during the sampling step of the feeding behavior and prevented continuous feeding.

The beetles avoided contact with S. berthaultii 1729 leaflets, less consumption occurred, the frequency of the “feeding” and “resting” behaviors was reduced, and the “moving” frequency increased in most cases. This suggested the presence of deterrents influencing host acceptance and initiation of feeding. On S. berthaultii 1726 and 1729, the frequency of some behaviors changed during the bioassay (2.5 h in duration), probably as a consequence of food deprivation.

Résumé

Nous avons étudié le comportement de nutrition d’adultes du doryphore de la pomme de terre sur des feuilles provenant de deux clones de Solanum berthaultii Hawkes (PI473340, clones #1726 et #1729) et sur des feuilles de S. tuberosum L. var. Norchip traitées avec un extrait de feuilles de S. berthaultii 1726. L’application d’extrait de feuilles de S. berthaultii 1726 (0,075 mg/cm2 de feuille) n’a pas modifié le comportement des adultes du doryphore de la pomme de terre, en dépis d’une consommation réduite. Sur S. berthaultii 1726, la consommation et le rhytme de consommation étaient réduits, la fréquence du comportement de locomotion a augmenté, la fréquence du comportement de repos a diminué et la fréquence du comportement de nutrition n’a pas varié par rapport aux résultats obtenus sur S. tuberosum. La propriété phagodissuadante de S. berthaultii 1726 était probablement perçue pendant la phase d’échantillonnage du comportement de nutrition et inhibait la poursuite du comportement.

Les doryphores évitaient le contact de S. berthaultii 1729 et la fréquence du comportement de nutrition et de repos étaient réduite tandis que la fréquence du comportement de locomotion était augmentée dans la plupart des cas. Ceci suggère que la présence de substance(s) répulsive(s) à influencée l’acceptation de la plante hôte et le commencement de la nutrition. Sur feuilles de S. berthaultii 1726 et 1729, la fréquence de quelques comportements a changé durant l’expérience (d’une durée de 2,5 h) probablement à cause de la faim.

[Fourni par les auteurs]

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 1 , February 1991 , pp. 219 - 230
Copyright
Copyright © Entomological Society of Canada 1991

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