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Larval critical weight, pupation and adult fecundity in the spotted stem borer, Chilo partellus Swinhoe (Lepidoptera: Pyralidae): An index of quality

Published online by Cambridge University Press:  19 September 2011

J. P. R. Ochieng'-Odero ,
A. M. Mzingirwa ,
P. E. W. Njoroge ,
M. D. O. Bungu ,
D. M. Munyinyi  and
F. O. Onyango
J. P. R. Ochieng'-Odero
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
A. M. Mzingirwa
Affiliation:
Mtwapa Regional Research Centre, Kenya Agricultural Research Institute (KARI), P. O. Box 16, Kikambala, Kenya
P. E. W. Njoroge
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
M. D. O. Bungu
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
D. M. Munyinyi
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
F. O. Onyango
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
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Abstract

The larval critical weight (Lcw) in the spotted stem borer, Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae) was 54.6 ± 1.0 mg for average sized male and female final instar larvae and was 63 and 39% of the larval maximum weight (Lmw) of males and females, respectively. There was a consistent decrease in weight from Lmw to pupal weight of 35% in both males and females over successive generations of rearing two laboratory populations. The adult weight was consistently about 37 and 22% lower than the pupal weight for males and females, respectively. During starvation, 25% of the final instar larvae produced a supernumerary moult. A positive correlation was derived between female pupal weight and fecundity. The results were similar to those derived from a study on the progeny of a wild population. A model representing the various fresh weight changes in relation to the Lmw has been suggested for this species. The model is similar to that proposed for other Lepidoptera. The results of this study are largely consistent with those carried out on other species of Lepidoptera and underline the value of using stable standards in assessing the quality of laboratory reared insects.

Résumé

Le poids critique de la larve (Lcw) chez Chilo partellus (Swinhoe) (Lepidoptere: Pyralidae) a ete de 54 ± 1.0 mg pour des larves de dernier stade males et femelles de tailles moyennes, alors que le poids maximal de larve (Lmw) a été de 63 et 39% pour les males et les femelles respectivement. Il y eu une baisse considérable de poids de 35% du Lmw au poids de la pupe aussi bien chez les males que chez les femelles pendant des générations successives de deux populations élévees au laboratoire. Le poids des adults a ete constamment de 37 et 22% en dessous du poids de la pupe pour les males et les femelles respectivement. Durant les périodes de jeûn, 25% des larves du dernier stade ont eu une mue suplementaire. Il y a eu correlation positive entre le poids de la pupe female et sa fécondite. Les résultats ont été comparables a ceux obtenus pendant l'etude sur la progéniture d'une population naturelle. Un model représentant les différents changements en poids frais en relation avec le Lmw a été suggéré pour cette espèce. Ce model est semblable a celui propose pour d'autres especes de lépidoptere. Les resultats de cette etude concorde bien avec ceux des travaux effectués sur d'autres espèces de lepidoptère et souligne l'importance de la standardisation des methodes d'evaluation de la qualite des insectes elévés en laboratoire.

Keywords

Chilo partellusfecunditylarval critical weightlife cyclepupation qualityreproductive performance
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 2 , April 1994 , pp. 123 - 127
Copyright
Copyright © ICIPE 1994

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