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The relationship between larval critical weight, latent feeding period and diet quality in the larval metamorphosis of Cnephasia Jactatana (walker) (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  19 September 2011

J. P. R. Ochieng-Odero
J. P. R. Ochieng-Odero
Affiliation:
Zoology Department, University of Auckland, Private Bag, Auckland, New Zealand
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Abstract

The lowest weight at which a final instar larva of the leafroller, Cnephasia jactalana (Walker) (Lepidoptera: Tortricidae) can initiate pupation, the larval critical weight, was unaffected by diet quality. Use of a non-nutritive artificial diet showed that the larval-pupal metamorphosis was possibly triggered by stretch receptors, and was not related to nutrition per se. However, a final-instar larva was not able to moult until it had ingested and assimilated the quantity of food required to attain the larval critical weight. The period between attaining the larval critical weight and the larval maximum weight is the latent feeding period which was found to be longer on higher-quality diets. The decrease from larval maximum weight to pupal weight depended on diet quality: optimum-quality diets gave the smallest decreases. The decrease from pupal to adult weight was not affected by diet. Reproductive performance was strongly affected by the quality of the diet during the latent feeding period.

Résumé

Le poids minimal auquel le dernier stade de la larve de Cnephasia jactatana (Walker) (Lepidoptera: Tortricidae) initie la pupation, le poids critique de la larve, n'a pas ete influence par la qualite de l'alimentation. L'utilisation d'un regime alimentaire artificiel non nutritif a montre que la metamorphose larve-pupe serait declanchee par l'expansion des recepteurs et ne serait pas done pas liee a l'alimentation en tant que telle. Toutefois, le dernier stade larvaire n'a pu se metamorphoser qu'apres avoir ingère la quantite d'aliments necessaire pour atteindre le poids critique de la larve. La periode entre le poids critique et le poids maximal de la larve est dite periode latente de nutrition; celle-ci a ete plus longue lorsque la larve a ete soumise a des reqimes alimentaires de grande valeur nutritive. La baisse du poids maximal de la larve par rapport au poids de la pupe depend de la qualite du regime alimentaire. Les baisses en poids les plus legeres ont ete obtenues avec des milieux nutritifs de qualite optimale. La baisse en poids de la pupe par rapport a celle de l'adulte n'a pas ete influencee par la qualite de l'alimentation par contre la reproduction a ete serieusement affectee par la qualite de la nourriture pendant la periode latente de nutrition.

Keywords

Artificial dietCnephasia jactatanaevaluationlarval critical weightlatent feeding periodlarval maximum weightmetamorphosisnutritionperformancequality
Type
Research Artilces
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 3 , June 1993 , pp. 397 - 402
Copyright
Copyright © ICIPE 1993

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