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NUTRITIONAL STUDIES OF EASTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE): II. STARCHES

Published online by Cambridge University Press:  31 May 2012

G. T. Harvey
G. T. Harvey
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste. Marie, Ontario
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Abstract

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Amylopectin added to a sugar-free wheat-germ diet was equal to or better than sucrose as a carbohydrate source, and appears to be readily utilized by the eastern spruce budworm (Choristoneura fumiferana (Clem.)). Larval growth on diets containing dextrins or potato starch shows that they are partly utilized. Starches from other sources, including those isolated from mature balsam fir (Abies balsamea (L.) Mill.) or white spruce (Picea glauca (Moench) Voss) needles, are not utilized to any extent, on the basis of larval growth on diets to which they have been added.

Sixth-instar budworm reared on artificial diets contain amylase(s) in midgut and salivary gland homogenates, which show a low rate of digestion of starches from host foliage. However, the presence of appreciable starch in frass from foliage-fed insects and the apparent low utilizability of foliar starch indicate that the latter is not an important nutrient for the budworm under natural conditions.

Résumé

Ajoutée à une diète de germe de blé sans sucre, l’amylopectine s’est avérée égale ou supérieure au sucrose en tant que source d’osés, et semble être aisément utilisée par la Tordeuse des bourgeons de l’Épinette, Choristoneura fumiferana (Clem.). La croissance larvaire obtenue sur des diètes contenant des dextrines ou de la fécule de pomme de terre montre que ces substances sont partiellement utilisées. D’après la croissance larvaire observée sur les diètes auxquelles ils ont été ajoutés, les amidons d’autres provenances y compris ceux isolés des aiguilles du Sapin baumier (Abies balsamea (L.) Mill.) ou de l’Épinette blanche (Picea glauca (Moench) Voss) à maturité ne sont nullement utilisés.

Les intestins et les glandes salivaires de la Tordeuse au sixième stade élevée sur diète artificielle contiennent des amylases, ce qui indique un faible taux de digestion des amidons du feuillage de l’arbre-hôte. Il appert cependant de la présence d’amidon en quantité considérable dans les chiures des insectes nourris au feuillage, ainsi que de la médiocre capacité évidente de l’amidon des feuilles à être utilisé, que ce dernier ne constitue pas une nourriture importante pour la Tordeuse dans les conditions naturelles.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 7 , July 1975 , pp. 717 - 728
Copyright
Copyright © Entomological Society of Canada 1975

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