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Selecting a character for identifying larval instars of the lepidopteran stemborers Sesamia calamistis Hampson (Noctuidae) and Eldana saccharina walker (Pyralidae) in maize

Published online by Cambridge University Press:  19 September 2011

O. Bonato  and
F. Schulthess
O. Bonato
Affiliation:
ORSTOM, Entomologie Agricole, B.P. 5045, 34032 Montpellier, France
F. Schulthess
Affiliation:
Plant Health Management Division, International Institute of Tropical Agriculture, Cotonou, Republic of Benin
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Abstract

In experiments to select a character for identifying larval instars in Sesamia calamistis and Eldana saccharina, body length, body width and head capsule width were measured in populations reared on artificial diet. Seven instars were found in S. calamistis and 5 in E. saccharina. For both species, body length was determined to be the best characteristic to distinguish instars because it was easy to measure and had the smallest error.

Résumé

Longueur et largeur du corps ainsi que largeur de la capsule céphalique ont été choisies pour identifier les différents stades larvaires de Sesamia calamistis et Eldana saccharina. Sept stades larvaires on été caractérisé pour S. calamistis et cinq pour E. saccharina, les deux espèces étant élevées sur milieu artificiel dans les conditions de laboratoire suivantes: 28 ± 0.5°C, 80 ± 10%RH, 12L:12D. Pour les deux espèces, la longueur du corps se révèle le meilleur caractère pour l'identification des stades car il est le plus facile à mesurer avec un minimum d'erreur.

Keywords

Sesamia calamistisEldana saccharinabody lengthbody widthhead capsuleSesamia calamistisEldana saccharinalongueur du corpslargeur du corpscapsule céphalique
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 2 , June 1998 , pp. 101 - 103
Copyright
Copyright © ICIPE 1998

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